Senior Front-end Engineer

CoW DAO is on a mission to protect Ethereum users from MEV and optimize trade execution across DeFi. We achieve this through the CoW Protocol, CoW Swap (a leading intent-based DEX aggregator), and the innovative MEV Blocker, which together help secure, aggregate, and route trades for optimal outcomes. We also fund values-aligned projects via the CoW Grants Program.

CoW Protocol is consistently ranked among the top DEX aggregators by monthly volume and is the largest intent-based exchange. Our MEV Blocker protects trades from harmful MEV extraction and is integrated across the Ethereum ecosystem. The CoW AMM is the only live AMM designed to protect liquidity providers from LVR (loss-versus-rebalancing).

With over 100 open-source repositories on GitHub, we’re transparent, community-driven, and deeply committed to the open-source ethos. Our real-time Dune Analytics dashboard showcases billions in cumulative trading volume and a rapidly growing user base. As we continue to scale, CoW DAO remains at the forefront of DeFi innovation, prioritizing security, efficiency, and decentralization.

Learn more

We’re looking for a passionate Senior Frontend Engineer to help take decentralized trading to the next level. You’ll take charge of our CoW DAO products and help shape what’s coming next, making sure the user experience is smooth across trading interfaces, analytics, docs, and more. We’re after a great communicator who loves working with a team and is eager to learn (especially about blockchain). If you thrive on ownership, like solving problems, and are curious about the world of blockchain, this might just be the role for you.

Tech stack we work with:

Frontend: Typescript, React, styled-components Web3: Web3, ethersjs, Hardhat, Solidity, IPFS, TheGraph, ENS Testing: Jest, Cypress, React Testing Library Analytics: Dune Analytics, Google Analytics

What you’ll be doing:

Develop and improve user-facing applications like CoW Swap on top of the CoW Protocol Build and implement new features quickly, with a focus on performance, accessibility, and quality Decide when to create reusable abstractions and when to build one-off features, always keeping scalability and maintainability in mind Contribute to the product roadmap by proposing new features, sharing design ideas, and helping the team prioritize tasks Push the boundaries of decentralized user interfaces. Our products are hosted traditionally but also deployed on decentralized networks like IPFS/ENS, and we work with decentralized infrastructure like The Graph and Ethereum nodes You’ll work across our open-source monorepo (CoW Swap and more), e.g. cowswap, cow-sdk, bff.

What we’re looking for:

Experience: 6+ years of professional experience building client-side web apps Technical skills: Expertise in front-end technologies (React, TypeScript, CSS, state management libraries like Redux, Recoil, or Jotai) Code quality: Ability to review and guide the team on architecture, code quality, and best practices Problem-solving: Strong debugging and problem-solving abilities Team player: Excellent communication skills and a willingness to collaborate and share knowledge Self-driven: You take ownership of your work and are proactive about learning and growing in your career Blockchain knowledge: Experience integrating frontend with smart contracts and familiarity with tools like Ethers.js (v5/v6), Viem Product vision: A solid understanding of the crypto DApp ecosystem, user experience, and market trends

Bonus points if you have:

DevOps & tooling: Experience with CI/CD pipelines, testing frameworks, and deployment tools; familiarity with cloud services (AWS, GCP, etc.) Backend experience: Knowledge of Node.js, databases, and RESTful or GraphQL APIs

Engineering