Senior Web3 Engineer (Web3)

TL;DR

Senior Web3 Engineer (Web3): Building and optimizing user-facing Web3 applications with an accent on security, usability, and UI design for wallet and transaction flows. Focus on integrating frontend applications with security-critical core libraries, ensuring safe handling of blockchain interactions, and building scalable component architectures.

Location: Remote (Europe, GMT–GMT+2)

Salary: $122,000

Company

An applied research and engineering lab operating at the intersection of cryptography, blockchain, and emerging technologies, focused on strengthening the long-term security of digital assets.

What you will do

• Own development of user-facing Web3 applications with a strong focus on security and usability.
• Design and implement high-quality UIs for wallet and transaction flows.
• Integrate frontend applications with security-critical core libraries.
• Ensure safe handling of permissions, errors, and edge cases in blockchain interactions.
• Collaborate closely with backend, protocol, and security engineers.
• Build scalable component architectures and manage frontend state.

Requirements

• Strong TypeScript skills and modern frontend experience (React or similar).
• Production experience building and shipping browser extensions.
• Solid understanding of Web3 fundamentals (wallets, JSON-RPC, signing flows).
• Security-aware mindset with experience handling sensitive logic.
• Strong UI/UX skills with attention to detail and user experience.
• Clear English communication and ownership mindset.

Nice to have

• Mobile development experience (React Native or iOS).
• ERC-4337 / account abstraction experience.
• Awareness of post-quantum cryptography.
• Backend experience in Node.js or Rust.
• Experience with Viem, ZeroDev, or similar tooling.