Senior Frontend Engineer (web3)

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’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