Udacity is hiring a remote Senior Frontend Software Engineer. This is a full-time position that can be done remotely anywhere in the United States.

Udacity - Advance your career with online courses.

Solana Foundation is looking to hire a Technical Project Manager, Ecosystem to join their team. This is a full-time position that can be done remotely anywhere in the United States.

0x is looking to hire a Senior Design Engineer, Matcha to join their team. This is a full-time position that is 100% remote with no geographical restrictions. Work remotely from anywhere.

Reddit is hiring a remote Staff Data Scientist, Consumer. This is a full-time position that can be done remotely anywhere in the United States.

Reddit - The front page of the internet.

HashiCorp is hiring a remote Sr. Developer Advocate. This is a full-time position that can be done remotely anywhere in the United Kingdom.

HashiCorp - Cloud infrastructure automation.

Who We Are And What We Do:

Contra is a network of independent creatives, connecting you with the talent and tools to get work underway. Our platform offers all the necessary tools for discovering, hiring, onboarding, managing, and paying flexible talent.

Why Join Contra's Journey?

Contra is building the platform for the future of work. People, companies, and agencies are looking to adopt more flexible working styles, and we are leading the way, with a network of over 1M freelancers and 50k clients who depend on Contra to work together and collaborate, 100% commission-free. We’ve raised over $44M from top VC’s including NEA, Unusual Ventures and Cowboy Ventures.

About You:

• You are an excellent, independent problem solver.
• You have high standards for craft, quality, and attention-to-detail for the work that you ship, and motivate others to raise the bar.
• You know how to articulate and balance the tradeoffs of rapid pace exploration and building performant, scalable, reliable, and quality systems.
• You have high standards for verbal and written communication and are experienced at working in a remote organization, preferring to over-communicate and collaborate synchronously when able.
• You thrive in a fast-paced and dynamic environment. Our team knows how to execute and is relentless about our velocity.
• You apply an ownership mentality to everything you ship, and collaborate cross-functionally with other teams to achieve success.
• You dedicate effort to staying up to date with new technologies, patterns, and AI.

In a day at Contra, you’ll probably:

• Contribute to our end-to-end TypeScript, GraphQL, React monorepo.
• Contribute to our Vitest/Playwright test suite.
• Participate in the RFC process, building alignment around new database and API schemas and new patterns.
• Participate in all parts of the product development process, like design critiques, code reviews, and cross-functional planning with your team.
• Work on maintaining a tidy home: eliminate technical debt, improve performance, address customer bugs, improve developer experience, etc.

Our Stack:

• Backend: TypeScript, PostgreSQL, GraphQL, NodeJS, Redis, Temporal
• Frontend: React, Relay, PandaCSS
• Data: Airbyte, dbt, Google BigQuery
• DevOps: ArgoCD, Docker, GitHub, Google Cloud Platform, Kubernetes
• Testing: Playwright, Vitest
• Tools: Linear, Mergify, PostHog, Slack, Turbo
• AI: OpenAI, Cursor, Supermaven, CodeRabbit (for code reviews — it’s actually great!)

Total Comp:

• Salary: $170,000 - $200,000 CAD
• Health + dental benefits
• Home Office Budget
• We will provide you with a company laptop on your start date

Interview Process

1. Intro Call with Recruiting Team (15-20 minutes)
2. Technical Interview with Hiring Manager (45 minutes)
3. Culture & Cross-Functional Interview (45 minutes)
4. Paid Technical Assessment (3 hours) + Presentation (60 minutes)
   1. CTO & Co-Founder
   2. Engineering Manager

Contra is an equal opportunity employer, committed to ersity and inclusion. We do not discriminate based on race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

Note: Contra communicates with applicants through @contra.com domains only. We never ask for money from potential employees. For the latest job postings, visit Contra Careers.

Salary and compensation

**公司简介：

2UP.io 是一个全新且令人兴奋的在线赌场和体育博弈平台，正准备正式上线。我们是从一个在全球范围内极具知名度的品牌中衍生出来的，该品牌曾是多名英超联赛足球队的主要赞助商。我们专注于下一代的iGaming（在线博弈），尤其是在加密货币、原创游戏、体育和电子竞技方面，致力于在全球舞台上发挥重要作用。Test site: 2uptest.com, password = 8888

**职位介绍：

我们正在寻找一位经验丰富、注重细节且责任心强的测试主管，加入我们全球化的在线加密赌场平台。该岗位将全面负责测试团队的搭建与管理，确保平台在快速迭代中保持高质量交付。您将直接与产品、技术、项目等团队协作，制定并优化测试流程、方法与标准，确保软件在功能、性能、安全等方面达到行业一流水准。

如果您拥有丰富的测试经验、出色的沟通能力，以及在细节和逻辑判断上极高的敏感度，我们期待您的加入，共同打造一个稳定、安全、极致体验的博彩平台。

**理想候选人：

**

您是一位对产品质量和用户体验高度执着的测试专家，具备全面的测试实战经验与成熟的团队管理能力。您曾主导多个复杂系统或数据敏感型产品的测试项目，擅长从0到1搭建测试流程与标准，并能够在快速迭代的节奏中精准识别风险与关键缺陷。

您学习能力强，能够迅速理解产品业务与技术方案，具备根据需求编写测试用例、拆解测试任务并组织实施的能力。您熟悉各种测试工具与方法，具备手动与自动化测试的全面能力，并对数据正确性、逻辑严谨性有极高的敏感度。您注重细节、思路清晰，能高效整理并呈现测试文档与分析报告，同时善于跨部门沟通，推动产品不断优化。

如果您具备博彩、加密货币、金融、电商等对数据要求高的产品背景，并拥有带领远程测试团队的经验，将是极大的加分项。我们期待您带领团队，在保障平台稳定性的同时，为用户提供极致体验的产品质量保障。

**岗位职责：

• 领导测试团队，制定测试战略、测试流程及测试规范，保障平台各模块质量稳定；

• 设计、编写并执行复杂和详尽的测试用例，覆盖核心功能模块及边界场景；

• 负责测试计划、测试报告、回归测试、上线验收等全流程管理；

• 组织并推动自动化测试策略，持续优化测试覆盖率与效率；

• 精通并操作测试工具（如 Selenium、Postman、Cypress、JMeter、TestRail、JIRA 等）；

• 执行 API、压力、性能、安全等专项测试；

• 敏锐识别缺陷，协助研发定位问题根因，提出合理化建议；

• 熟悉测试数据类应用的逻辑与验证机制，对数据正确性与逻辑链条有高度把控；

• 与产品、开发、设计、项目团队保持高效协作，参与评审与需求澄清；

• 对测试中发现的问题进行整理、分析、可视化汇报与演示，为产品质量提供有力依据；

• 在不断变化的需求和产品迭代中持续推进测试流程优化，确保质量与效率的双重提升。

**任职要求：

**

• 经验：至少4年作为QA测试相关经验，能够在软件开发生命周期的各个阶段执行有效的测试流程；

• 团队管理：具有带领测试团队并进行项目管理的经验优先，有手动和自动化测试经验者优先；

• 技能: 掌握软件测试的相关知识，能够熟练运用Selenium、Cypress、JIRA和TestRail等测试工具执行测试用例、跟踪缺陷及进行回归测试；

• 思维模式：具备逻辑思维和问题解决能力，能够迅速适应并处理复杂的测试场景。在面对复杂的项目需求或不明确的测试规范时，保持灵活性和韧性至关重要；

• 协作能力：具备良好的协作、责任感、情绪管理与跨部门沟通能力，推动测试与产品开发高效衔接；

• 测试工具: 熟练使用 Selenium、Cypress、Postman、TestRail、JIRA 等主流测试工具，熟悉 RESTful API 测试、性能测试工具（如 JMeter）及测试数据管理；

• 测试技能：熟练掌握功能测试、回归测试与自动化测试，具备完整测试流程实战能力，优先考虑具备复杂系统或数据敏感型产品（如博弈、金融、数据平台等）测试经验者；

• 数据分析：对数字敏感，高度注重细节与数学逻辑严谨性，能准确校验公式及数据处理逻辑，仔细分析测试结果，清晰记录缺陷并确保问题及时处理；

• 文档呈现：具备出色的文档能力，能将测试结果、Bug描述、分析结论清晰呈现；

• 问题解决能力：极强的问题分析与解决能力，能在多线程、多模块环境中快速定位并复现问题；

• 软技能：协作、沟通、主动性、责任感和情商是这一角色的核心能力；

• 沟通能力：拥有优秀的沟通能力，能够清晰地汇报测试结果、提出改进建议，并与团队成员进行有效的沟通和反馈；

• 语言能力：中英文阅读能力良好，能理解技术文档及中英文界面者优先。

**加分项：

**

• 熟悉中国及全球在线博彩市场和产品；

• 熟悉Online Crypto Casino在线博彩市场和产品；

• 有搭建测试框架、引入 CI/CD 流程、构建测试报告系统等经验；

• 熟悉加密支付、钱包、体育游戏、Slot 等模块测试流程；

• 有国际化测试协作经验，或能胜任多语言环境下的多平台兼容性测试。

Eyeo is hiring a remote Frontend Engineer (Growth). This is a full-time position that is 100% remote with no geographical restrictions. Work remotely from anywhere.

Eyeo - Develops open source software and makers of AdblockPlus.

Apollo is hiring a remote Developer Advocate, Growth. This is a full-time position that can be done remotely anywhere in the United States.

Apollo - We help developers build great apps.

Infrastructure & DevOps Engineer at Raiku

As an Infrastructure & DevOps Engineer at Raiku, you will lead critical engineering efforts that drive the performance and scalability of next-generation distributed systems. You’ll join a highly proficient team of core engineers, all of whom have contributed to foundational and novel infrastructure innovations.

We believe in hiring exceptional iniduals who are deeply motivated by complex core infrastructure challenges and guided by a coherent system design philosophy that moves our industry forward. Expect frequent group discussions on architecture, design specs, and code reviews. We ship quality code quickly and often — and we are deeply committed to it.

About Raiku

Raiku is reimagining Solana’s transaction and consensus ecosystem by enabling validators to connect directly with purpose-built execution environments. Our platform delivers unprecedented performance, guaranteed transaction inclusion, and deterministic settlement for the next generation of internet-native applications. We unlock radical bandwidth and latency improvements by shifting Solana’s focus to efficient state verification — enabling high-velocity, reliable applications at massive scale​.

About the Team

Our entire platform is built in Rust, connecting Solana’s L1 with advanced L2 extensions and enabling deeply complex network interactions. Your primary focus in this role will involve Rust systems programming, infrastructure architecture (e.g., Kubernetes), and operational scripting across languages such as Rust, Go, and Typescript. Full-stack understanding — from bare metal to application interfaces — is critical to success here.

What You’ll Bring

• 4+ years of experience in infrastructure engineering, preferably within high-standard fintech, data, cloud, or DevOps environments.
• Senior-level experience as an SRE or Infrastructure Engineer with a strong Kubernetes background.
• Deep proficiency with Infrastructure as Code tools (Terraform/Terragrunt) and infrastructure automation (Helm, GitOps).
• Familiarity with monitoring and alerting using Prometheus and PromQL.
• Experience with infrastructure and data security practices, including KMS and HashiCorp Vault.
• Ability to ship high-quality, opinionated architectural choices and uphold software best practices.
• Strong communication skills in English (both written and spoken).

Our Stack

• Infrastructure: AWS/GCP + bare metal, Kubernetes, Terraform/Terragrunt, Prometheus/Thanos, Helm, HashiCorp Vault, FluxCD
• Languages: Rust, Golang, Typescript, PostgreSQL
• Smart Contract Development: Anchor, Solana Program Library (SPL)

Preferred Qualifications

• Experience operating validators on distributed networks.
• Active engagement with the blockchain security research community, through open-source contributions, publications, or speaking at conferences.

Benefits

• Competitive compensation packages based on ongoing market analysis, including tokens.
• Remote-first culture with flexible hours — self-initiative and independence are highly valued.
• Work with highly talented engineers passionate about building the future of the internet.
• A collaborative and dynamic work environment that rewards inidual ownership and impact.
• Opportunities for rapid professional growth within one of the most technically ambitious projects in web3.

About the Role

As a Protocol Research Engineer at Raiku, you’ll e deep into Solana’s consensus mechanisms, validator dynamics, and block-building edge cases to help push the boundaries of what’s possible on-chain. Your work will directly inform and evolve Raiku’s infrastructure — including ahead-of-time auctions, deterministic inclusion, and decentralized execution environments.

This role is ideal for an engineer who obsesses over protocol-level behavior, from slashing conditions and fork choice rules to novel token incentive structures and inclusion guarantees. You will collaborate closely with our core engineering team, lead technical research deep-es, and shape future SIMD proposals and Raiku-native designs.

Core Responsibilities

Protocol Research & Development

• Analyze Solana protocol changes (SIMDs) and model their impact on consensus, block production, and validator incentives.
• Explore alternative leader schedules, transaction scheduling policies, and failure recovery mechanisms.
• Design and prototype changes to Raiku’s validator sidecar, ackermann-node, and execution environment logic.

Incentives & Economics

• Simulate and reason about token-level economics (e.g. fee markets, slot auctions, stake redistribution) in the context of Raiku’s architecture.
• Collaborate with the team on reward structures that align validators, apps, and execution primitives.
• Contribute to internal tooling for simulating validator behavior under new fee models or coordination layers.

Research & Thought Leadership

• Write internal memos and public-facing research exploring protocol edge cases, inclusion determinism, and priority fee market design.
• Lead technical discussions and workshops across the team and ecosystem partners.
• Represent Raiku in upstream governance and protocol forums (e.g., GitHub SIMDs, community calls).

What We’re Looking For

• Deep understanding of Solana’s architecture, consensus algorithm (Tower BFT), and validator mechanics.
• Proficiency in systems programming (Rust or C++) and experience working with validator or node clients (Agave, Jito, etc.).
• Comfort reasoning about distributed systems, forks, slashing, transaction lifecycle, and fee markets.
• Demonstrated ability to write clear, technical research — either internal design docs or public content.
• A rigorous, systems-level thinker who thrives in ambiguity and wants to help shape the frontier of internet-scale consensus.

Bonus Points

• Experience contributing to SIMD proposals or L1 protocol development (Solana, Cosmos, Ethereum, etc.).
• Familiarity with execution environments (SVM, EVM, Move) or decentralized scheduling infrastructure.
• Interest in MEV mitigation, slot auctions, or validator tokenomics.
• Past experience in distributed systems research, zero-knowledge design, or compiler/runtime engineering.

Why Join Raiku?

Raiku is building a high-performance execution layer atop Solana that enables guaranteed transaction inclusion, pre-confirmations, and slot-level coordination — unlocking a new design space for ultra-reliable onchain apps. We’re backed by leading investors, deeply technical, and shipping fast.

• Work with a world-class engineering team building core infrastructure from first principles.
• Help define the next evolution of block production and validator coordination on Solana.
• Remote-first, async culture optimized for focus, ownership, and velocity.
• Competitive salary + meaningful token upside.
• Home office and workstation setup stipend.

About Chainlabs

Chainlabs is a data startup focused on enabling web3 analytics. We specialize in identifying blockchain address ownership and tracking addresses linked to illicit activities. Our work supports industry leaders like Nansen, Chainalysis, and Arkham in their wallet labeling efforts.

Our primary clients include anti-money laundering (AML) service providers, as well as law enforcement, traders, and academic researchers. Backed by Lunar Rails (200 employees), Chainlabs maintains the agility and independence of a startup while benefiting from financial stability and strong industry connections.

Position Overview

We are seeking a Senior Back End Engineer to develop key data pipelines, including web scrapers, ETL workflows, and AI agents. Your work will enable us to extract critical data from clearnet and darknet platforms and power our blockchain intelligence solutions.

In this role, you’ll design high-performance systems that move data seamlessly into PostgreSQL and BigQuery environments. By tackling complex challenges in web scraping and data engineering, you’ll help us collect, organize, and analyze the web3 ecosystem at scale.

Key Responsibilities

Web Scraping**:

• Design and deploy web scrapers to extract data from complex websites like Etherscan, Arkham, ChainAbuse, etc.
• Implement data collection mechanisms with support for IP rotation, CAPTCHA handling, and dynamic content rendering.
• Help us build Crawlers and Scrapers to find hidden web3 wallets on the Darknet.

Data Engineering**:

• Build and maintain ETL pipelines to ingest scraped data into PostgreSQL or Bigquery.
• Classify the collected web3 wallets into predefined categories (e.g., Swap, Bridge, Scam, Ransomware) according to our taxonomy definitions.

API Maintenance**:

• Maintain and enhance Chainlabs API endpoints to provide seamless access to the data.
• Utilize Python frameworks (e.g., Flask) to support and extend RESTful APIs.

Data Analytics**:

• Use SQL to analyze on-chain data, ie, the behavior of collected wallets, their interaction with other entities, and other on-chain trends

Requirements

• Proficiency in Python for data engineering, web scraping, API development; and databases like PostgreSQL.
• Experience with frameworks such as Scrapy, Selenium and BeautifulSoup.
• Understanding of advanced Web Scraping techniques, including IP rotation, proxy management, and CAPTCHA handling.
• Familiarity with modern AI models, APIs, and SDKs (e.g. OpenAI, LLMs).
• Hands-on experience with ETL orchestration tools like Apache Airflow
• Strong problem-solving and not afraid to work with a wide variety of data.
• Ability to work independently and meet deadlines in a remote environment.
• A passion for blockchain and web3 technologies. An interest in combatting financial cybercrime.
• *Nice to Have: Familiarity with RESTful API development using_ Flask framework.
• Nice to Have: Strong experience with SQL and some exposure to Javascript.
• Nice to Have: Experience with on-chain analytics

Benefits

• Competitive salary.
• Remote work environment with a flexible schedule.
• A team that values data and AI; our founder is a data scientist.
• A company culture that values transparency, speed, courage, and curiosity.
• Opportunities for fast personal and professional growth.
• Exposure to a global network of industry experts and partners.

QuickNode is looking to hire a Support Engineer II to join their team. This is a full-time position that can be done remotely anywhere in Portugal or Spain.

*About CoW DAO

CoW DAO is on a mission to protect Ethereum users from the dangers of DeFi. It does this by supporting the development of CoW Protocol, CoW Swap, MEV Blocker, and CoW AMM, and by funding values-aligned projects through the CoW Grants Program.

CoW Protocol is the second-largest DEX aggregator by monthly volume and the first-largest intents-based exchange. MEV Blocker is currently involved in ~4% of all Ethereum transactions, making it the category leader. CoW AMM is the only live AMM that protects LPs from LVR (loss-versus rebalancing).

As a member of CoW DAO’s core team, you will have the opportunity to shape these essential products, and contribute to the Ethereum ecosystem more broadly.

About the role**

Location: We are a fully remote team, and although we hire almost globally, there is a preference for this role to be based in Europe or remote +/- 4 hours CEST time

Please note we’re not hiring from the US, Australia, or New Zealand.

Position: Full-time contractor

We are looking for an enthusiastic, self-motivated, Senior Backend Engineer to help us build the next generation of decentralised trading protocols. As a dedicated backend engineer, you will gain ownership of our existing backend services and influence the creation, design, and execution of future features and products. You will work on technically challenging aspects of our off-chain services and our developer-facing APIs and help ensure the delivery of reliable and performant features to improve CoW Protocol.

Our Tech Stack

• Backend Code: Rust, Tokio, Cargo, Git (https://github.com/cowprotocol/services)
• Infrastructure: Pulumi, AWS, Docker, Kubernetes, Grafana, Prometheus, Elasticsearch
• Other codebases: Typescript, Python, Solidity

What you will do

• Architect and design our off-chain services (core auction protocol as well as the orderbook) to support feature growth and the rapidly changing requirements that come from being an application on a constantly evolving blockchain.
• While your focus will be writing concurrent backend systems in Rust, you will also interact with our Smart Contracts written in Solidity and develop your understanding of auction mechanisms and DeFi protocols
• Participate in our on-call rotation to help ensure the reliability of our production systems (on-call work is additionally compensated)
• Work closely with researchers and the product team to ship features and come up with new solutions for challenging technical problems
• Deliver high-quality code for features from concept until production (including state-of-the-art monitoring of our production systems)
• Give thoughtful and in-depth code reviews of your colleagues’ contributions to our open-source codebase

Who you are

• You have 5+ years of production experience with systems-level programming languages, with at least 1+ year of hands-on production experience using Rust
• You have practical experience working in web3 (ideally in DeFi and the Ethereum ecosystem)
• You have excellent computer science, programming, and algorithmic skills
• Experience with operating, maintaining, and architecting complex software systems
• You care deeply about the quality, readability, observability, and testability of your code
• You proactively give technical direction to improve performance, prevent issues, optimise data usage, and refactor the codebase
• You are a team player, strong communicator, and gladly share your expertise with others
• You collaborate effectively with a remote-first team on a large, open-source codebase
• Ideally, someone senior who can mentor colleagues and provide direction.
• You are excited to explore and gain experience with Ethereum

What we can offer you

• Flexible work environment: Join our hub in Lisbon or work remotely
• Token plan: Have a stake in our mission and shape the future of CoW DAO
• Periodic gatherings: Enjoy opportunities to connect with the rest of the team through regular trips
• Conference allocation: Stay up-to-date with ecosystem advancements using our conference budget
• Learning budget: Use our learning budget to support your higher ambitions
• Hardware budget: Take advantage of a hardware budget for acquiring necessary equipment
• Make an impact: You are joining a startup where you can make a huge difference. Your work matters!
• Flat hierarchies mean fewer processes and bureaucracy - see more of your ideas come to life!
• Flexible work and vacation times: Prioritize work-life balance through our robust flexible work policy and vacation allowance
• Growth: If you’re someone who loves taking the initiative and getting things done, CoW offers lots of opportunities for your inidual growth

Referral Program

Earn 6.000 USDC or USD with the refer-to-earn program. More details here.

Culture

Life within the CoW Protocol is an incredible adventure! We take pride in our collaborative approach, embracing autonomy and fostering a culture of big thinking and continuous growth. We value impact, ownership, simplicity, and team spirit. Plus, we’re all about feedback, coming together, and enjoying the journey along the way!

At CoW Protocol, we strive to create a space where everyone feels included and empowered. We believe that our products and services benefit from our erse backgrounds and experiences. All qualified applicants are considered for positions regardless of race, ethnic origin, age, religion or belief, marital status, gender identification, sexual orientation, or physical ability.

Udacity is hiring a remote Back-end Engineer II. This is a full-time position that can be done remotely anywhere in the United States.

Udacity - Advance your career with online courses.

We’re looking for a strategic-minded AI Automation Developer to join our team on a long-term, part-time basis. In this role, you’ll take the founder’s clearly defined vision and turn it into elegant, reliable automations that streamline the business.

What You’ll Work On:

• Make scenarios (often complex, involving GPT, Notion, and Drive integrations)
• AI-driven document generation
• Expense tracking and budget monitoring
• Lead capture, nurturing, and client conversion workflows
• Tailored guest and client portals with role-specific logic
• Calendar-based triggers and deadline alerts
• Hierarchical document generation using GPT
• Internal logs, summaries, and trackers

Tech Stack:

• We use Make, Notion, and OpenAI (GPT-4). This isn’t just drag-and-drop automation; you’ll need to understand:
• APIs and JSON
• Regex and parsing logic
• Structuring data for AI input/output
• Debugging complex, multi-branch scenarios
• Code-level thinking when automation complexity increases

Bonus Skills:

• Familiarity with Python, JavaScript, or PHP (not required, but a plus)
• Strong problem-solving and automation architecture skills

About You:

• Comfortable working independently with clear specs
• Enjoys building systems that simplify workflows
• Proactive, detail-oriented, and able to suggest improvements
• Motivated by making a tangible impact and improving processes

Contra is looking for a skilled Frontend Engineer to build and enhance user-friendly, high-performance web applications. If you have experience with modern JavaScript frameworks, responsive design, and creating seamless user experiences, we’d love to hear from you!

Responsibilities:

• Develop and optimize scalable, responsive frontend applications.
• Collaborate with designers and backend developers to implement UI/UX designs.
• Write clean, maintainable, and well-documented code.
• Ensure cross-browser and mobile compatibility.
• Optimize performance for speed and scalability.
• Stay updated with the latest frontend technologies and best practices.

Requirements:

• Proven experience as a Frontend Engineer with a strong portfolio.
• Proficiency in JavaScript, TypeScript, React, Vue, or Angular.
• Strong understanding of HTML, CSS, and modern styling frameworks (Tailwind, SCSS, Styled Components, etc.).
• Experience with RESTful APIs, GraphQL, and state management (Redux, Zustand, Vuex, etc.).
• Knowledge of build tools (Webpack, Vite, Babel) and performance optimization techniques.
• Understanding of UI/UX principles and accessibility best practices.
• Strong problem-solving skills and ability to work independently.

Nice to Have:

• Experience with Next.js, Nuxt.js, or SvelteKit.
• Familiarity with testing frameworks (Jest, Cypress, Testing Library).
• Knowledge of CI/CD pipelines and deployment (Vercel, Netlify, AWS).
• Basic backend experience (Node.js, Firebase, or similar).

Fluence Labs is looking to hire a QA Engineer to join their team. This is a full-time position that is 100% remote with no geographical restrictions. Work remotely from anywhere.

Dapper Labs is looking to hire a Frontend Software Engineering Intern to join their team. This is an internship position that can be done remotely anywhere in Canada, or the United States.

Solana Foundation is looking to hire a Senior Data Engineer to join their team. This is a full-time position that can be done remotely anywhere in the United States.

About Nimbus

Nimbus is a research team that focuses on developing an Ethereum client and library. We believe that the largest deployment of Ethereum will potentially be on embedded systems and Nimbus is designed to perform well on embedded, mobile and generally resource-restricted devices.

Building the stack from the ground up, we’re translating the latest Ethereum research into practical, performant and reusable libraries to provide a fertile exploration ground for further R&D.

About Nomos

Nomos is a new blockchain designed from the ground up with the original cypherpunk ethos: decentralisation, censorship resistance, permissionless-ness and privacy. It will serve as the trustless agreements layer of the Logos stack. The forthcoming Nomos network will provide a common infrastructure layer upon which communities and aspiring network states can build social, governance, and financial services that uphold their community members’ fundamental rights and values.

The role & responsibilities:

You will join the Nimbus team but work closely with Nomos to consume and provide feedback on specifications, ensuring a deep understanding of both projects. You will:

• Develop a deep understanding of Nimbus and Nomos, including their architectures and designs.
• Consume specifications from Nomos and provide feedback where necessary, clarifying any ambiguities.
• Collaborate with the Nimbus team to identify potential issues or areas for improvement in the specifications.

Requirements:

• Strong understanding of blockchain technology and its underlying principles -> You have been in the blockchain industry for several years and are highly familiar with decentralised technology.
• You care about privacy and building protocols and applications that are truly decentralised, privacy-preserving and censorship-resistant.
• You have a technical background (Software Engineer or similar) & experience in documentation and specification.
• You are proactive and communicative; making things happen comes easily to you.

Bonus points:

• Experience working in an open-source organisation.
• You’ve used Nimbus Client or have worked in a privacy-focused project/organisation.

Hiring process:

• Intro call with our People Ops team
• Interview with Nimbus Team Lead
• Interview with Logos Program Lead

[The steps may change along the way if we see it makes sense to adapt the interview stages, so please consider the above as a guideline.]

Compensation:

The expected compensation for this role is 100k USD. We are happy to pay in any mix of fiat/crypto.

Coursera is hiring a remote Staff Software Engineer, Frontend. This is a full-time position that can be done remotely anywhere in India.

Coursera - We provide universal access to the world's best education.

Medium is hiring a remote Staff Web Engineer. This is a full-time position that can be done remotely anywhere in the United States.

Medium - A place to read and write big ideas and important stories.

Babylon is looking to hire a Senior IT Security Engineer to join their team. This is a full-time position that can be done remotely anywhere in the United Kingdom, Europe or Asia.

Oddball is hiring a remote Fullstack Engineer. This is a full-time position that can be done remotely anywhere in the United States.

Oddball - We're a high-end boutique dev shop.

Sardine is looking to hire a Security Analyst to join their team. This is a full-time position that can be done remotely anywhere in Canada, or the United States.

"

Why This Role

As a Founding Forward Deployed AI Engineer at Cekura, you'll work hand-in-hand with our largest customers to help them test and deploy AI voice agents into production - embedding with their teams, navigating complex environments, and building real-world solutions that drive impact.

This hybrid role spans engineering, product, and customer success. One week you’re deep in AI workflows or backend integration; the next, you’re sharing critical insights to shape the product roadmap.

If you thrive wearing many hats, enjoy solving tough problems, and want to make AI agents more reliable and production-ready - you’ll love this role.

What You’ll Do

Make Enterprise Customers Love You – Partner with sales to close deals and deliver outstanding outcomes for our largest customers. You'll embed with their teams, build integrations, and ensure a smooth path to production with our platform.

Design Scenarios That Push the Limits – Create real-world and edge-case conversations that challenge voice agents across erse workflows. Your scenarios will uncover bugs, blind spots, and improve reliability.

Drive the Product to Be More Valuable – Help prioritize features and shape the roadmap based on hands-on customer needs.

Be the Go-To Tech Guru – Lead workshops, troubleshoot complex issues, craft demos, improve docs, and unblock adoption.

Who You Are

* Hands-on with a CS/EE background from Tier 1 College (IITs)

",

"

Why This Role

As a Founding Forward Deployed AI Engineer at Cekura, you'll work hand-in-hand with our largest customers to help them test and deploy AI voice agents into production - embedding with their teams, navigating complex environments, and building real-world solutions that drive impact.

This hybrid role spans engineering, product, and customer success. One week you’re deep in AI workflows or backend integration; the next, you’re sharing critical insights to shape the product roadmap.

If you thrive wearing many hats, enjoy solving tough problems, and want to make AI agents more reliable and production-ready - you’ll love this role.

What You’ll Do

Make Enterprise Customers Love You – Partner with sales to close deals and deliver outstanding outcomes for our largest customers. You'll embed with their teams, build integrations, and ensure a smooth path to production with our platform.

Design Scenarios That Push the Limits – Create real-world and edge-case conversations that challenge voice agents across erse workflows. Your scenarios will uncover bugs, blind spots, and improve reliability.

Drive the Product to Be More Valuable – Help prioritize features and shape the roadmap based on hands-on customer needs.

Be the Go-To Tech Guru – Lead workshops, troubleshoot complex issues, craft demos, improve docs, and unblock adoption.

Who You Are

* Hands-on with a CS/EE background from Tier 1 College (IITs)

",

"

About Stamp

Stamp is the first AI Native email client.

Every day, 4 billion people check their emails, spending 6+ hours in their inboxes. The number of emails we receive is increasing every year, and yet we’re stuck using the same workflows we did 20 years ago.

That’s why we built Stamp — it doesn’t just optimize your workflows, it automates them entirely. With Stamp, every single email you receive is automatically prioritized and filtered. Replies are automatically generated in your voice, with your context. And complex workflows are completed in seconds with Stamp Agent.

If you’re excited to build the 1000x version of a product already used by billions, we’d love to hear from you.

About the Role

As a senior frontend mobile engineer, you’ll be in the driver’s seat for core technical decisions regarding our mobile app UX, UI, and optimization, all while exercising more agency and product ownership than you’d have anywhere else.

You’ll have the opportunity to wear many hats while working to build a world class mobile application with an AI Native experience.

Ideally, you’re:

1. A builder: You’ve built several mobile frontends in the past and have worked with popular mobile frameworks (ReactNative + Expo is a plus)

About the Team

Archit (CEO & Founder) previously worked as a Software Engineer at Stripe, where he saved the company $1,000,000+ yearly by optimizing database storage. He also previously worked on Autonomous Vehicles at Apple and Robotic Surgery at Johnson & Johnson Robotics. Before that, he graduated from Cornell at age 20, where he led a team of 50 students building mobile apps with 10,000+ daily users. While still in high school, he built a PPE price tracker that scaled to 50,000 users during the height of the pandemic.

",

"

Who We Are

At DevCycle, we believe that no engineering team should fear deploying to Production. Managing the rollout of new features and services with feature flags should be as seamless as committing to source control. Our mission is to be the favourite feature flagging platform for developers.

Our small, passionate, and ambitious team strives to work on the right things at the right times through transparency, collaboration, and empathy. We build thoughtful tools and products that enhance developer’s workflow, challenging ourselves to push the boundaries of what’s possible to maximize efficiency, speed, cost, and value. If this resonates with you, read on.

Overview

We’re looking for a motivated and curious Full-Stack Engineer to join our growing team. This is a great opportunity for someone early in their career who’s excited about building real products, learning best practices, and working with modern technologies. You’ll collaborate closely with experienced engineers and product managers to ship features and improve our platform. If you’re passionate about learning, problem-solving, and building tools used by other developers, we’d love to hear from you.

Responsibilities

* Contribute to the design and implementation of our full-stack application.

Requirements

* 1–3+ years of experience in full-stack JavaScript/TypeScript development.

Nice to Have (Not Required)

* Previous experience working at a startup or small team.

Our Tech Stack

* Frontend & Backend : TypeScript, Node.js, Next.js, Nest.js, React

Work Environment

Preference is given to candidates in the Greater Toronto Area, as the team meets 1–2 times a week at our Toronto office. However, we are also open to fully remote work across Canada with the right candidate.

If you're passionate about pushing the boundaries of full-stack development and want to join a small and dynamic team, we'd love to hear from you.

",

Reddit is hiring a remote Senior Frontend Engineer, Top Of Funnel. This is a full-time position that can be done remotely anywhere in the United Kingdom.

Reddit - The front page of the internet.

About Nimbus

Nimbus is a research team that focuses on developing an Ethereum client and library. We believe that the largest deployment of Ethereum will potentially be on embedded systems and Nimbus is designed to perform well on embedded, mobile and generally resource-restricted devices.

Building the stack from the ground up, we’re translating the latest Ethereum research into practical, performant and reusable libraries to provide a fertile exploration ground for further R&D.

About Nomos

Nomos is a new blockchain designed from the ground up with the original cypherpunk ethos: decentralisation, censorship resistance, permissionless-ness and privacy. It will serve as the trustless agreements layer of the Logos stack. The forthcoming Nomos network will provide a common infrastructure layer upon which communities and aspiring network states can build social, governance, and financial services that uphold their community members’ fundamental rights and values.

The role & responsibilities:

You will join the Nimbus team but work closely with Nomos to consume and provide feedback on specifications, ensuring a deep understanding of both projects. You will:

• Develop a deep understanding of Nimbus and Nomos, including their architectures and designs.
• Consume specifications from Nomos and provide feedback where necessary, clarifying any ambiguities.
• Collaborate with the Nimbus team to identify potential issues or areas for improvement in the specifications.

Requirements:

• Strong understanding of blockchain technology and its underlying principles -> You have been in the blockchain industry for several years and are highly familiar with decentralised technology.
• You care about privacy and building protocols and applications that are truly decentralised, privacy-preserving and censorship-resistant.
• You have a technical background (Software Engineer or similar) & experience in documentation and specification.
• You are proactive and communicative; making things happen comes easily to you.

Bonus points:

• Experience working in an open-source organisation.
• You’ve used Nimbus Client or have worked in a privacy-focused project/organisation.

Hiring process:

• Intro call with our People Ops team
• Interview with Nimbus Team Lead
• Interview with Logos Program Lead

[The steps may change along the way if we see it makes sense to adapt the interview stages, so please consider the above as a guideline.]

Compensation:

The expected compensation for this role is 100k USD. We are happy to pay in any mix of fiat/crypto.

Chainlink Labs is looking to hire a Frontend Engineer, UX to join their team. This is a full-time position that is 100% remote with no geographical restrictions. Work remotely from anywhere.

Za-What?

Zammad is an open-source helpdesk platform with big ambitions to be the best of its kind. With technical founder Martin Edenhofer at the helm, Zammad empowers teams around the world to provide the kind of next-level customer service that keeps people coming back.

The proof is in the pudding: with over 4,500 GitHub stars, 100,000 active installations and a community with steady, sustainable growth since its inception in 2016, Zammad has built a reputation of rock-solid reliability that our users depend on to ensure success at the frontlines of their business. You can’t buy that kind of trust.

Interested? Read on, and reach out if you’d like to have a hand in shaping the future of Zammad.

Open position for a Senior Full Stack Developer

Zammad is growing — and we’re looking for a Senior Full Stack Developer to join our agile, remote-first team. As we scale our helpdesk platform to the next level, we need someone who thrives in a fast-moving, collaborative environment and wants their code to make a real impact.

As a Senior Full Stack Developer, you will:

• Develop and maintain features across the full stack, ensuring a seamless experience from front to back.
• Enhance the user interface and experience of Zammad using Vue.js, crafting responsive, intuitive, and accessible web applications.
• Build and optimize back-end functionalities with Ruby on Rails, ensuring efficient, scalable, and maintainable code.
• Work closely with UX/UI designers to translate visual concepts into functional online experiences.
• Collaborate with product owners and back-end engineers to brainstorm and implement new features.
• Troubleshoot, debug, and upgrade existing software, addressing both front-end and back-end issues.
• Contribute high-quality code reviews and engage with the team for continuous improvement and knowledge sharing.

In short, your work will give life to the experience of using our platform.

Requirements

Our must-haves

• Demonstrated expertise in full stack development, with advanced skills in modern front-end frameworks (e.g. Vue.js, Svelte, React or Angular) paired with a robust proficiency in backend development using Ruby on Rails.
• A thorough understanding of web architecture, including proficiency with CSS, semantic HTML, and core JavaScript concepts.
• Hands-on experience working with REST APIs.
• Commitment to clean, maintainable, and well-documented code.
• A proactive mindset: you’re not just a coder, you’re a problem solver.
• Experience working in agile environments, including collaboration with Product Owners and SCRUM teams.
• A continuous learner's attitude, eagerly embracing both teaching and learning opportunities.
• Working in European Time Zone

Our wishlist

• Familiarity with GraphQL.
• A background in contributing to open-source products.
• Experience with TailwindCSS.
• Experience with TypeScript.

Show us what you’ve got

In addition to a résumé/CV and cover letter, be sure to include the following:

• Your scars and stories from past battles on the front-end, both lost and won.
• The strongest projects in your portfolio.
• The social and communication skills that will make you an effective addition to our remote-first team.

What’s in it for you?

Embrace the opportunity to make a significant impact at Zammad during a dynamic phase of growth. You'll be empowered to:

• Innovate within a flat hierarchy, where your ideas and initiative are highly valued.
• Become an integral part of an international, tight-knit team that thrives on collaboration and unity.
• Enjoy the flexibility and freedom of remote work, supported by management committed to helping you do your best work.

On top of that:

• As an agile, open-source company, our team is built around a flat hierarchy that gives you the latitude to pursue your own ideas.
• You will be part of a close-knit, international team with an uncanny sense of unity.
• Last but not least, you will enjoy the unbeatable freedom of remote work and flexible hours under management that does everything it can to support you in achieving your best work.

Salary and compensation

Benefits

🏖 Paid time off

🏔 Company retreats

📚 Learning budget

ActiveCampaign is hiring a remote Senior Software Engineer, Ruby on Rails. This is a full-time position that can be done remotely anywhere in the United States.

ActiveCampaign - Grow your business with customer experience automation.

As a Senior Rust Core Engineer at Raiku, you will spearhead our engineering efforts, driving the innovation and implementation of next-generation high-performance distributed systems. You will work with a highly proficient team of core engineers who have all contributed to foundational and novel network components.

We believe in hiring only exceptional iniduals who are highly motivated to work on complex core infrastructure challenges and are motivated by a coherent system design philosophy that will drive our industry forward. Expect frequent group discussions on architecture, new design specs and code reviews. We are all deeply committed to frequently shipping quality code.

About Raiku

Raiku is reimagining Solana’s consensus ecosystem by developing software that directly connects validators with purpose-built execution environments. We’re building institutional-grade infrastructure that delivers unprecedented performance, guaranteed transaction inclusion, and deterministic settlement for the next generation of internet-native applications. We unlock radical bandwidth and latency improvements by shifting Solana’s focus to state verification.

About the Engineering Team

As a team, we are building an entire platform written in Rust, which connects the L1 and L2s and allows us to create deeply complex scenarios and interactions with the running network. While your primary focus for this role is Rust and complex interactions with different components, you will likely also be involved in infrastructure (e.g., k8s), script writing, and supporting projects in other languages (e.g., Go). Working at every level of the stack is necessary to understand the big picture and how everything is wired together.

Responsibilities

• Highly motivated to contribute to our mission and be part of something bigger. Excited to work on projects that are ground-breaking and complex.
• Refactor, improve and lead software design implementation
• Communicate effectively with the team and document your code. It is also expected that founding engineers mentor less experienced engineers.
• Read and understand protocol specifications and be able to break them into issues and turn them into Rust code.
• Maintaining a large codebase with many components and keeping it well-designed, future-proofed, modular and highly performant
• Automate security testing processes and benchmarks, creating innovative tools and frameworks for continuously improving our systems.

What You’ll Bring:

• A bachelor’s or master’s degree in Computer Science, Engineering, or a related technical field, coupled with practical experience in blockchain systems.
• At least 3 years of experience in distributed systems, with a deep technical understanding of L1 and L2 architectures.
• Strong proficiency in Rust, with at least 2-3 years of Rust experience.
• Strongly emphasising writing performant and secure code.
• Demonstrated experience in designing, developing, and deploying scalable distributed systems.
• An analytical mindset with the ability to anticipate and mitigate emerging security threats, leveraging a comprehensive understanding of the blockchain landscape.

Preferred Qualifications

• Active open-source contributions in core protocol engineering (such as Firedancer, Reth, Lighthouse, Geth, …).
• Direct involvement in the Solana ecosystem, with contributions to Solana’s runtime, scheduler, or other core systems.
• Experience writing Solana Program Library (SPL) and Anchor or similar frameworks
• Active engagement with the blockchain security research community, evidenced by contributions to open-source projects, publications, or presentations at notable conferences.

Benefits

• Competitive remuneration packages based on iterative market research, including tokens
• Remote-first and self-initiating with flexible hours
• Work with team players who are genuinely excited about their impact and projects.
• A dynamic and collaborative work environment that fosters innovation and recognises inidual contributions to collective success
• Opportunities for professional growth and advancement within a rapidly growing technological frontier

We’re looking for a skilled No-Code Developer to help us design, build, and launch functional, responsive websites and automation workflows—without writing a single line of code. If you’re experienced with tools like Webflow, Airtable, and Zapier and have a strong eye for clean design and user experience, we’d love to work with you.

🚀 What You’ll Do

• Design and build websites using modern No-Code platforms
• Translate designs and concepts into fully functional sites
• Customize and optimize for responsiveness, performance, and usability
• Set up automations and integrations between apps (Zapier-style workflows)
• Collaborate closely with designers, PMs, and other stakeholders

✅ What We’re Looking For

• Proven experience as a No-Code Developer or similar role
• Strong grasp of UX/UI principles and responsive design
• Proficiency with No-Code platforms (e.g. Webflow, Softr, Framer)
• Ability to build clean, custom layouts with attention to detail
• Clear communication and collaborative mindset

✨ Bonus Skills

• Experience with Zapier, Airtable, Mailchimp, Go High Level, or similar tools
• Familiarity with Google Tag Manager, GA4, and other tracking setups
• Experience with eCommerce platforms like Shopify, WooCommerce, or Webflow eCommerce

• Develop, optimize, and maintain responsive websites and web apps
• Collaborate with designers to bring UI/UX concepts to life
• Write clean, scalable, and efficient code
• Ensure cross-browser and mobile compatibility
• Troubleshoot and debug performance issues
• Stay current with modern web development practices and tools

• Solid experience as a Web Developer with a strong portfolio
• Proficiency in JavaScript, and a modern front-end framework (React, Vue, or Angular)
• Experience with back-end technologies (Node.js, Python, PHP, etc.)
• Familiarity with databases (SQL, Firebase, MongoDB, etc.)
• Strong understanding of SEO and website performance optimization
• Comfortable working independently and delivering on deadlines

• Experience with headless CMSs, Webflow, or WordPress
• Familiarity with API integrations and third-party services
• Experience deploying to platforms like AWS, Vercel, or Netlify

Salary and compensation

Are you a talented Senior Developer looking for a remote job that lets you show your skills and get decent compensation? Look no further than Lemon.io — the marketplace that connects you with hand-picked startups in the US and Europe.

What we offer:

• The rate depends on your seniority level, skills and experience. We’ve already paid out over $11M to our engineers.
• No more hunting for clients or negotiating rates — let us handle the business side of things so you can focus on what you do best.
• We’ll manually find the best project for you according to your skills and preferences.
• Choose a schedule that works best for you. It’s possible to communicate async or minimally overlap within team working hours.
• We respect your seniority so you can expect no micromanagement or screen trackers.
• Communicate directly with the clients. Most of them have technical backgrounds. Sounds good, yeah?
• We will support you from the time you submit the application throughout all cooperation stages.
• Most of our projects involve working in a fast-paced startup environment. We hope you like it as much as we do.
• Through our community, we will connect you with the best developers from more than 50 countries.

We have several Senior React Full-Stack positions available. Here are the general requirements for these roles.

Senior Ruby & React Position:

• 5+ years of software development experience
• 3+ years of commercial experience with React.js and Ruby and Ruby on Rails

Senior React & Node Position:

• 7+ years of software development experience.
• 4+ years of commercial experience with React.js and Node.js.
• 3+ years of experience with AWS and TypeScript are a must.
• Hands-on experience with Next.js is a must.

Senior React & Python Position:

• 4+ years of software development experience.
• 3+ years of commercial experience with React.js and Python.
• 3+ years of experience with AWS and TypeScript is a must.

Other requirements:

• Strong technical skills: as a Senior Developer, you are expected to be able to create projects from scratch and have a deep understanding of application architecture.
• Clear and effective communication in English — advanced ability to discuss business tasks, justify decisions, and communicate issues. Good self-presentation is also essential for upcoming client calls.
• Strong self-organizational skills — ability to work full-time remotely with no supervision.
• Reliability — we want to trust you and expect that you won’t let us and the client down.
• Adaptability and Flexibility — the ability to onboard the project promptly after accepting it and start delivering results quickly.

Sounds good for you? Apply now and join the Lemon.io community!

NOT YOUR TECH STACK?

We have different projects for Senior Developers, so if you have 4+ years of commercial experience in software development and you are fluent with AI Engineering, Swift, we would be happy to communicate and provide you with a project that matches your experience. Just apply, and we will share more details with you.

If your experience matches our requirements, be ready for the next steps:

• VideoAsk — watch a short video about our startup, up to 10 minutes
• Complete your profile on our website
• 30-minute screening call
• Technical interview
• Feedback
• Magic Box (we are looking for the best project for you).

We do not provide visa assistance, and our cooperation model does not include the benefits typically offered with direct hire.

P.S. We work with developers from 50+ countries in different regions: Europe, LATAM, the U.S (if you are an owner of W-9 ben form), Canada, Asia (Philippines, Indonesia), Oceania (Australia, New Zealand, Papua New Guinea), and the the UK. However, we have some exceptions.

At the moment, we don’t have a legal basis to accept applicants from the following countries:

• European: Iceland, Liechtenstein, Kosovo, Belarus, Russia, and Serbia.
• Latin America: Cuba and Nicaragua
• Most Asian countries and Africa.

We expand and shorten the list of exemptions regularly.

We do not provide visa assistance, and our cooperation model does not include the benefits typically offered with direct hire.

Do you represent a company with engineers who match the description and want to collaborate with us through staff augmentation? Then register here.

Quantitative Software Engineer

Who We Are

We are building a cutting-edge delta-neutral trading protocol that captures volatility and yield across BTC, ETH, and liquid altcoins through advanced basis trading, OTC liquidity strategies, and perpetual derivatives.

By combining market-neutral strategies and innovative hedging solutions, we provide unparalleled capital efficiency for institutional and advanced traders. Our team has deep experience from leading crypto protocols, traditional finance firms, and exchanges, backed by top-tier investors and partners. We are creating the next generation of yield-optimised trading infrastructure for the digital asset markets.

What We Are Building

We are pioneering a delta-neutral, volatility-driven trading infrastructure designed to enable scalable exposure to major digital assets while managing directional risk. Our protocol integrates:

• Delta-Neutral Strategies: Leveraging basis trades, funding rate arbitrage, and hedging for consistent, market-neutral yield.
• OTC Integration: Discounted asset acquisition for cost optimisation and arbitrage opportunities.
• Automated Hedging: Combining perpetual futures, options, and liquidity strategies to minimise risk.

This platform is tailored to institutions, treasuries, and sophisticated market participants looking for capital-efficient yield in the crypto space.

Who We Are Looking For

We are seeking a Quantitative Software Engineer who is excited to work at the intersection of financial innovation and frontier technology. You are a problem-solver who thrives in a fast-paced, zero-to-one environment and have a passion for designing sophisticated trading systems.

You will play a pivotal role in building and optimising the internal trading and arbitrage platform, enabling automated delta-neutral strategies that scale across both centralised exchanges and DeFi markets.

Role Summary

The Quantitative Software Engineer will develop and maintain a high-performance internal trading and arbitrage platform. You will design automated delta-neutral derivative strategies, integrate with smart contracts, and collaborate across teams to deliver robust trading solutions for real-world market conditions.

Key Responsibilities

• Develop and maintain an internal trading and arbitrage platform, focusing on real-time low-latency data capture, order execution, and risk monitoring. Design and implement automated delta-neutral derivative strategies across centralised venues and DeFi smart contracts. Establish secure and efficient connectivity with
• custody providers, centralised exchanges, and OTC desks for seamless trading operations. Optimise systems for
• latency, scalability, and high-performance execution.
• Collaborate with smart contract engineers to integrate delta-neutral strategies within DeFi ecosystems.
• Build internal monitoring tools to track risk, funding rates, and arbitrage opportunities
• in real-time. Work cross-functionally with other engineers and quantitative analysts to drive product innovation.

Qualifications

• Minimum 2 years’ professional experience at a reputable crypto trading firm, hedge fund, DeFi protocol, or digital asset exchange, with a proven track record of delivering high-quality trading systems in production environments.
• Expert-level proficiency in Python programming, with demonstrable experience in architecting, developing, and maintaining robust, high-performance trading systems. Experience with advanced Python libraries (e.g., NumPy, pandas, asyncio, websockets) and hands-on exposure to asynchronous, event-driven programming is required.
• Proficiency in Rust/C++/Go is highly desirable, including experience in building performance-critical components, low-latency systems, or integrating low latency modules with Python applications.
• Hands-on experience with market-making engines or quantitative trading platforms, including system design, order management, strategy implementation, and real-time risk management. Familiarity with order book dynamics, liquidity provisioning, and exchange connectivity (REST/WebSocket APIs, FIX protocol, etc.) is essential.
• Deep understanding of networking, CPU and memory models, and low-level programming concepts, including multi-threading, concurrency, and performance profiling. Experience with optimizing system resource usage and troubleshooting latency or throughput bottlenecks is required.
• Familiarity with Solidity and blockchain fundamentals, including smart contract development, security best practices, wallet integration, and decentralised infrastructure (e.g., EVM-compatible chains, Layer 2 scaling solutions, bridges).
• Demonstrated quantitative and analytical skills, including experience designing, backtesting, and optimizing quantitative trading strategies. Strong grasp of statistics, probability, and time-series analysis; proficiency in using simulation frameworks and data analysis tools.
• Strong understanding of financial markets and market microstructure, especially in the context of crypto assets, derivatives, and DeFi protocols.
• Experience working with large-scale data pipelines and real-time data processing, including ETL design, data validation, and integration with cloud-based or distributed systems (e.g., Kafka, Redis, TimescaleDB).
• Comfortable with DevOps practices, including containerization (Docker), CI/CD pipelines, infrastructure-as-code, and monitoring/alerting tools.
• Ability to work collaboratively in a remote-first, fast-paced environment, including excellent communication skills, self-motivation, and the capacity to manage multiple priorities and deliver under tight deadlines.
• Fluent in English, both written and spoken, with the ability to clearly explain complex technical concepts to both technical and non-technical stakeholders.
• Bachelor’s degree or higher in Computer Science, Mathematics, Engineering, Physics, or a related quantitative discipline is strongly preferred.

Our Engineering Stack

• Frontend: React, Next.js, Wagmi, Viem, TailwindCSS.
• Backend: Python, Solidity, SQL, GraphQL, Docker, AWS, Ethereum.

What We Offer

• Competitive Salary: Commensurate with experience.
• Globally remote working opportunities with flexible hours.
• An opportunity to build the next generation of yield-optimised trading infrastructure in crypto.
• Collaboration with a world-class team driving innovation in delta-neutral strategies and OTC trading.
• The chance to work on a protocol that bridges centralised and decentralised markets, delivering solutions for institutional-grade DeFi.

Why Join Us?

If you are passionate about building automated delta-neutral strategies, low-latency systems, and cutting-edge trading solutions, this is your opportunity to make a real impact. Join us as we transform how institutions capture volatility and yield in the crypto markets.

Apply now and help redefine the future of decentralised capital efficiency.

Are you a talented Senior Developer looking for a remote job that lets you show your skills and get decent compensation? Look no further than Lemon.io — the marketplace that connects you with hand-picked startups in the US and Europe.

What we offer:

• The rate depends on your seniority level, skills and experience. We've already paid out over $11M to our engineers.
• No more hunting for clients or negotiating rates — let us handle the business side of things so you can focus on what you do best.
• We'll manually find the best project for you according to your skills and preferences.
• Choose a schedule that works best for you. It’s possible to communicate async or minimally overlap within team working hours.
• We respect your seniority so you can expect no micromanagement or screen trackers.
• Communicate directly with the clients. Most of them have technical backgrounds. Sounds good, yeah?
• We will support you from the time you submit the application throughout all cooperation stages.
• Most of our projects involve working in a fast-paced startup environment. We hope you like it as much as we do.
• Through our community, we will connect you with the best developers from more than 50 countries.

We have several Senior React Full-Stack positions available. Here are the general requirements for these roles.

Senior Ruby & React Position:

• 5+ years of software development experience
• 3+ years of commercial experience with React.js and Ruby and Ruby on Rails

Senior React & Node Position:

• 7+ years of software development experience.
• 4+ years of commercial experience with React.js and Node.js.
• 3+ years of experience with AWS and TypeScript are a must.
• Hands-on experience with Next.js is a must.

Senior React & Python Position:

• 4+ years of software development experience.
• 3+ years of commercial experience with React.js and Python.
• 3+ years of experience with AWS and TypeScript is a must.

Other requirements:

• Strong technical skills: as a Senior Developer, you are expected to be able to create projects from scratch and have a deep understanding of application architecture.
• Clear and effective communication in English — advanced ability to discuss business tasks, justify decisions, and communicate issues. Good self-presentation is also essential for upcoming client calls.
• Strong self-organizational skills — ability to work full-time remotely with no supervision.
• Reliability — we want to trust you and expect that you won’t let us and the client down.
• Adaptability and Flexibility — the ability to onboard the project promptly after accepting it and start delivering results quickly.

Sounds good for you? Apply now and join the Lemon.io community!

NOT YOUR TECH STACK?

We have different projects for Senior Developers, so if you have 4+ years of commercial experience in software development and you are fluent with AI Engineering, Swift, we would be happy to communicate and provide you with a project that matches your experience. Just apply, and we will share more details with you.

If your experience matches our requirements, be ready for the next steps:

• VideoAsk — watch a short video about our startup, up to 10 minutes
• Complete your profile on our website
• 30-minute screening call
• Technical interview
• Feedback
• Magic Box (we are looking for the best project for you).

We do not provide visa assistance, and our cooperation model does not include the benefits typically offered with direct hire.

P.S. We work with developers from 50+ countries in different regions: Europe, LATAM, the U.S (if you are an owner of W-9 ben form), Canada, Asia (Philippines, Indonesia), Oceania (Australia, New Zealand, Papua New Guinea), and the the UK. However, we have some exceptions.

At the moment, we don’t have a legal basis to accept applicants from the following countries:

• European: Iceland, Liechtenstein, Kosovo, Belarus, Russia, and Serbia.
• Latin America: Cuba and Nicaragua
• Most Asian countries and Africa.

We expand and shorten the list of exemptions regularly.

We do not provide visa assistance, and our cooperation model does not include the benefits typically offered with direct hire.

Do you represent a company with engineers who match the description and want to collaborate with us through staff augmentation? Then register here.

Salary and compensation

Benefits

🌎 Distributed team

⏰ Async

🚫 No politics at work

🎅 We hire old (and young)

Modern Treasury is hiring a remote Software Engineer - Payments. This is a full-time position that can be done remotely anywhere in the United States.

Modern Treasury - Payment operations solutions that automate the full cycle of money movement.

About us

Ambush is an AI company developing AI research & products that accelerate onchain adoption. We’re building Web3’s first autonomous AI agents to simplify wealth creation & onchain safety.

We’re a lean & hyper performance-oriented team; we are competitive, we like moving fast, and we run head-first towards seemingly impossible ideas. Our entire team is crypto-native & we have a shared North Star of solving web3’s hardest challenges.

Our team is led by one of crypto’s prominent anons, Psycho.

About the role:

We’re hiring a Lead AI/ML Engineer with deep experience designing and deploying real-world AI systems, with a focus in NLP, GenAI, and evaluation systems.

You’ll work directly with our CTO to architect AI infrastructure that powers intelligent, responsive onchain products. Because we’re building crypto-native interfaces with AI at the core, the ideal candidate is fluent in the modern GenAI stack, has opinions on model evaluation, and isn’t afraid to go deep into both product UX and system performance.

No formal crypto work experience is required, although general interest in crypto is a must.

Requirements:

• 4+ years of production AI/ML experience, with a focus on Python, HF Transformers, other NLP tools, and proper evaluations.
• Strong understanding of modern GenAI ecosystems: frontier models, open models, vector databases, embeddings, RAG, prompt orchestration, etc.
• Hands-on experience building evaluation frameworks and benchmarks for AI systems.
• Track record of deploying and maintaining production systems — ideally including non-cloud (local or edge) inference.
• You’re product-minded and comfortable navigating ambiguity across the AI stack.

Responsibilities

• Architect and implement complex multi-model AI systems — including retrieval-augmented generation (RAG), local model inference, and hybrid pipelines.
• Manage evaluations for open-ended AI tasks (e.g. classification, summarization, question-answering) with clear metrics and iterative feedback loops.
• Contribute to product strategy and help define how AI fits into core user flows.
• Own the full lifecycle: prototyping, productization, monitoring, and iteration.
• Work closely with design and product teams to ship user-facing AI features.
• Stay ahead of the curve on LLM advances, OSS tools, and model performance trends.

Why join Ambush?

• Industry leading pay: strong base salary + uncapped profit share + equity
• Lean & high-impact team; we hate bureaucracy & will not grow past ~10 people
• One of the fastest growing AI companies in crypto
• Proven leadership team with several acquisitions under their belt

Internal full-time hires only, no contractors or agencies

Peerspace is hiring a remote Principal Front End Engineer. This is a full-time position that can be done remotely anywhere in the United States.

Peerspace - Unique venues for meetings, events, photo & film shoots.

DuckDuckGo is hiring a remote Senior Software Engineer, Windows Desktop App. This is a full-time position that is 100% remote with no geographical restrictions. Work remotely from anywhere.

DuckDuckGo - Smarter search without the tracking.

Plaid is hiring a remote Software Engineer - Web. This is a full-time position that can be done remotely anywhere in the United States.

Plaid - Develop the future of financial services.

Remote Executive Assistant / Software-Savvy Generalist

Full-Time | Remote | Work Directly With the Founder

I manage a portfolio of companies and investments across multiple industries, and I’m looking for a smart, highly capable, and tech-oriented Executive Assistant to help me stay organized, move faster, and operate at a high level.

This is not a traditional assistant role. I'm looking for someone who can act as my right hand — comfortable managing operations behind the scenes, running my inbox and calendar, coordinating with team members, and continually optimizing how I work across multiple businesses.

If you have a passion for software, systems, or design — even better. This role is ideal for someone with a blend of executive support skills, tech fluency, and sharp organizational instincts.

I encourage you to apply even if you don’t have every skill listed — what matters most is that you’re a fast learner who can keep up and grow with me.

Bonus Skills (Not Required, But Highly Valued)

If you’ve worked with any of the following, please mention it:

• Spreadsheets: Google Sheets, Excel (formulas, dashboards, reporting)

• Design tools: Canva, Revit, Blender, Figma

• Project/Construction tools: Primavera Cloud, permit tracking, scheduling software, Trello, Asana, Monday.com

• Coding: HTML, CSS, JavaScript, React, Python

• Marketing & Data: Google Ads, BI dashboards, CRM tools, data management

• No-code/automation: Notion, Airtable, Zapier

• AI Tools: ChatGPT, Claude, and others

What You’ll Do

• Manage and prioritize my inbox (drafting, responding, organizing)

• Own calendar management and cross-timezone scheduling

• Track deliverables and follow-ups across multiple businesses

• Handle task management and ensure effective delegation

• Summarize research, meetings, and business updates

• Create reports, slide decks, dashboards, simple no-code websites, and more

• Build or refine systems that improve workflows and visibility

• Coordinate with internal team members discreetly and efficiently

• Occasionally assist with personal admin, travel, or errands

You Are

• Hyper-organized, reliable, and resourceful

• A fast learner and clear communicator (especially in writing)

• Independent and proactive — you don’t wait to be told what to do

• Fluent in English (spoken and written)

• Comfortable with tech and eager to improve workflows

• Experienced working with founders, execs, or fast-moving teams

Logistics

• Remote – open to candidates worldwide (LATAM, Eastern Europe, SE Asia ideal)

• Full-time

• $1,000–$4,000/month depending on experience

• Flexible hours, with some overlap with EST preferred

• Long-term role with room to grow in scope and responsibility

Soft Skills

This role demands more than just execution — I’m looking for a partner who brings energy, intelligence, and collaboration into our work.

• Excellent English communication – able to explain complex ideas clearly in writing and speaking. Bonus if you speak multiple languages.

• Team player – collaborative, open-minded, and easy to work with.

• Proactive and innovative – takes initiative, solves problems creatively, and aims to deliver excellent work.

• Startup mindset – comfortable with shifting priorities, wearing many hats, and making fast decisions.

How to Apply

Please send the following to [email protected]:

• A short note introducing yourself and why this role excites you

• A link to your resume or LinkedIn

• Brief examples of past experience in a similar role

• (Optional but appreciated): A short video (max 2 minutes) introducing yourself

In addition, please answer the following four questions in your email or application:

1. If I gave you zero onboarding but full access, what’s the first thing you’d do in your first 24 hours?

2. What’s one weird or unique skill or obsession you have that you think would be useful in this role?

3. Write a short, professional reply to this message: “Hey, can you hop on a call today?” (You’re slammed and the request is vague.)

4. Send me a list of 3 tools or frameworks you'd use to manage my time, tasks, and communications. Briefly explain how you'd use them.

Salary and compensation

GitLab is hiring a remote Associate Support Engineer (EMEA). This is a full-time position that is 100% remote with no geographical restrictions. Work remotely from anywhere.

GitLab - A single application for the entire DevOps lifecycle.

As a Senior Rust Core Engineer at Raiku, you will spearhead our engineering efforts, driving the innovation and implementation of next-generation high-performance distributed systems. You will work with a highly proficient team of core engineers who have all contributed to foundational and novel network components.

We believe in hiring only exceptional iniduals who are highly motivated to work on complex core infrastructure challenges and are motivated by a coherent system design philosophy that will drive our industry forward. Expect frequent group discussions on architecture, new design specs and code reviews. We are all deeply committed to frequently shipping quality code.

About Raiku

Raiku is reimagining Solana’s consensus ecosystem by developing software that directly connects validators with purpose-built execution environments. We’re building institutional-grade infrastructure that delivers unprecedented performance, guaranteed transaction inclusion, and deterministic settlement for the next generation of internet-native applications. We unlock radical bandwidth and latency improvements by shifting Solana’s focus to state verification.

About the Engineering Team

As a team, we are building an entire platform written in Rust, which connects the L1 and L2s and allows us to create deeply complex scenarios and interactions with the running network. While your primary focus for this role is Rust and complex interactions with different components, you will likely also be involved in infrastructure (e.g., k8s), script writing, and supporting projects in other languages (e.g., Go). Working at every level of the stack is necessary to understand the big picture and how everything is wired together.

Responsibilities

• Highly motivated to contribute to our mission and be part of something bigger. Excited to work on projects that are ground-breaking and complex
• Refactor, improve and lead software design implementation
• Communicate effectively with the team and document your code. It is also expected that founding engineers mentor less experienced engineers.
• Read and understand protocol specifications and be able to break them into issues and turn them into Rust code.
• Maintaining a large codebase with many components and keeping it well-designed, future-proofed, modular and highly performant
• Automate security testing processes and benchmarks, creating innovative tools and frameworks for continuously improving our systems.

What You’ll Bring:

• A bachelor’s or master’s degree in Computer Science, Engineering, or a related technical field, coupled with practical experience in blockchain systems.
• At least 3 years of experience in distributed systems, with a deep technical understanding of L1 and L2 architectures.
• Strong proficiency in Rust, with at least 2-3 years of Rust experience.
• Strongly emphasising writing performant and secure code.
• Demonstrated experience in designing, developing, and deploying scalable distributed systems.
• An analytical mindset with the ability to anticipate and mitigate emerging security threats, leveraging a comprehensive understanding of the blockchain landscape.

Preferred Qualifications

• Active open-source contributions in core protocol engineering (such as Firedancer, Reth, Lighthouse, Geth, …).
• Direct involvement in the Solana ecosystem, with contributions to Solana’s runtime, scheduler, or other core systems.
• Experience writing Solana Program Library (SPL) and Anchor or similar frameworks
• Active engagement with the blockchain security research community, evidenced by contributions to open-source projects, publications, or presentations at notable conferences.

Benefits

• Competitive remuneration packages based on iterative market research, including tokens
• Remote-first and self-initiating with flexible hours
• Work with team players who are genuinely excited about their impact and projects.
• A dynamic and collaborative work environment that fosters innovation and recognises inidual contributions to collective success
• Opportunities for professional growth and advancement within a rapidly growing technological frontier

About APF Company Limited

APF Company Limited is a Hong Kong headquartered blockchain ecosystem fund focused on strategic investments and active trading strategies in liquid cryptocurrency markets.

Overview

We’re seeking a talented Founding Quantitative Developer to join our Hong Kong team, where you’ll play a pivotal role in building and refining tools for cryptocurrency trading and blockchain integration. You’ll develop algorithms, integrate with decentralized finance (DeFi) platforms, and optimize systems for performance. This is an exciting opportunity to apply your technical expertise in a high-impact role, with rewards tied to the team’s success in a dynamic market.

Key Responsibilities

• Build and deploy trading algorithms to seize opportunities in cryptocurrency markets, ensuring scalability and efficiency.
• Integrate trading systems with DeFi protocols, developing secure smart contracts to enable automated strategies.
• Optimize low-latency infrastructure to support high-frequency trading in volatile market conditions. Monitor and enhance existing tools, proactively identifying areas for improvement to maintain a competitive edge.
• Collaborate with team members to design robust solutions, sharing insights to drive innovation. Keep pace with blockchain advancements, ensuring our systems align with evolving DeFi standards and protocols.

Qualifications

Education:

• Bachelor’s, Master’s, or Ph.D. in a quantitative field such as Computer Science, Mathematics, Physics, Engineering, or Economics from a reputable institution.

Work Experience:

• 2-5 years in a related field.

Technical Skills:

• Strong programming skills in Python (required) and C++ or similar languages (preferred) in Linux-based environments.
• Experience with data structures, algorithms, and writing efficient, well-documented code. Knowledge of Solidity for smart contract development and familiarity with blockchain concepts (e.g., web3, decentralized networks).
• Comfort with APIs (e.g., REST, WebSocket) and cryptographic techniques for secure integrations. Blockchain & DeFi:
• Understanding of DeFi ecosystems, including protocols like Uniswap, Aave, or similar platforms. Ability to develop and audit smart contracts for reliability and security.

Mindset & Attributes:

• Curiosity and enthusiasm for cryptocurrencies, trading, and blockchain technology.
• Sharp analytical skills with a knack for solving complex technical challenges.
• Ability to thrive under pressure, adapting quickly to shifting priorities.
• Collaborative spirit, eager to contribute ideas and learn from others.
• Strong sense of ownership, delivering high-quality work with precision.

Nice-to-Haves

• Experience trading cryptocurrencies or working with financial markets.
• Familiarity with high-frequency trading systems or market data analysis.
• Exposure to tools like SQL, bash, or cloud-based DevOps workflows.
• Contributions to open-source blockchain projects or a portfolio of DeFi-related work.