Job Title: Senior Web3 Engineer

Company Name: Project Eleven

Job Details: RemoteFull,Time

Job Url: https://hiring.cafe/viewjob/obssyqgsxdfb797e

Job Description: Posted 3mo agoSenior Web3 Engineer@ Project ElevenView All JobsWebsiteUnited KingdomRemoteFull TimeResponsibilities:owning development, designing interfaces, integrating librariesRequirements Summary:Senior Web3 Engineer with strong TypeScript frontend, Web3, and security-focused UI/UX experience.Technical Tools Mentioned:TypeScript, React, Browser Extensions, Web3, EVM, JSON-RPC, Viem, ZeroDev, Node.js, Rust
About Project ElevenProject Eleven is an applied lab of builders and technologists working at the intersection of quantum computing and cryptography. We build impactful solutions that push the digital-asset ecosystem to a more secure future. Our focus is post-quantum migration: upgrading wallets, identity, and settlement rails to quantum-safe primitives without breaking UX, composability, and developer workflows.Our mission is to future-proof digital assets and preserve self-sovereignty in a post-quantum world. We do that by building the canonical tooling and products teams can adopt: crypto-agile infrastructure, reference implementations, and integrations that fit real constraints like latency, cost, compatibility, key rotation, and recovery.We work with leading ecosystems to make this migration real through products we build, audits, testnets, and cutting edge research. The vision we are have is clear: a proven upgrade path, production-ready tooling and users retaining control of their assets and identity, before CRQC exists.The roleWe're looking for a Senior Web3 Engineer to join our growing Product Engineering team. As a Web3 Engineer, you'll play a pivotal role in helping to build the canonical tools and products to protect digital assets and preserve self-sovereignty in a post-quantum world.This role is a full-time, fully remote position in Europe (GMT to GMT+2).What you'll be responsible forOwn the development of user-facing blockchain applications with a strong focus on security, usability, and reliabilityDesign and implement high-quality user interfaces for interacting with blockchain wallets and transaction flowsIntegrate frontend applications with security-critical core libraries without re-implementing sensitive logicEnsure safe handling of user inputs, permissions, error states, and edge cases in blockchain interactionsCollaborate closely with backend, protocol, and security engineers to align UX with system constraints and guaranteesBuild and maintain scalable component architectures and frontend state management solutionsEnsure applications meet high standards for performance, accessibility, and cross-platform compatibilityParticipate in usability testing and iterate on designs based on user feedback and security considerationsWhat you bringStrong proficiency in Typescript and modern frontend engineering (e.g. React or similar)Production experience building and publishing browser extensionsStrong understanding of EVM/Web3 fundamentals e.g. wallet architecture, JSON-RPC, signature flows, integration with smart contractsSecurity-minded with experience working with security-sensitive code e.g. key handling, signing flows, storage, encryptionKey experience consuming security-critical librariesDemonstrated ability to deliver high-fidelity UI/UXStrong design skills and attention to detailExperience designing component libraries and UX flowsObsession with customer experience and usability testingHigh ownership and comfortable owning features end-to-end i.e. requirements → UI prototypes → Implementation → QAStrong English communicationWhat we'd love to seeExperience with mobile development e.g. React Native, iOS developmentExperience with ERC-4337 account abstractionAwareness and understanding of post-quantum cryptographyBackend experience e.g. building lightweight supporting services in Node.JS or RustPrior experience using Viem and ZeroDev (or similar)Equal OpportunityWe are committed to equal employment opportunity and believe that diverse teams build better products. All qualified applicants will receive consideration without regard to any protected characteristic under applicable law.