Senior Frontend Engineer

Job Description This is a remote position. A C rypto wallet security infrastructure provider are looking for a Senior Frontend Engineer (Paris, EU or US based). They develop the most secure wallet-as-a-service infrastructure in Web3 : an API-first wallet management system, ideal for applications and organizations seeking to provide secure access to all blockchains through a single integration ) . APIs and SDKs were designed for wallet programmability and efficient implementations, enabling fast deployments, smart automation flows, as well as granular sets of permissions and policies via secure authentication credentials. They are on the way to become the leading wallet infrastructure for the multi-trillion-dollar digital asset industry. The company is SOC-2 certified, employs 30 people across 6 countries and has raised over $20M since creation with prestigious investors. Their solution is used and trusted by major international corporations. They are looking for someone with deep expertise in modern frameworks and cross-platform development, paired with strong UX instincts and a track record in fintech, who understands the craft of building business-grade software : noticing the details, moving quickly, and delivering with rigor. MISSIONS As a Senior Frontend Engineer, you will help the company drive the user-facing side of their platform. In this role, you’ll own features end to end, turning complex requirements into tools that make financial workflows effortless for developers, admins, and end users. You will build web and mobile apps, refining SDKs, and designing interfaces that feel fast, intuitive, and trustworthy. You will move fluidly between polished user experiences and the developer tools that make them possible. Your responsibilities : Take full ownership of features, from idea to launch to iteration. Build web and mobile apps for our Wallets-as-a-Service platform. Develop SDKs and tools that make integrations simple. Bring fintech-grade UX to blockchain wallets. Design for clean architecture, speed, and security. Work with Product and Design to shape and ship features fast. Write clear docs, review code, and uphold high standards. Requirements You are a firm believer that Speed matters, but never at the expense of security, clean architecture, reliable performance, and clear docs. Requirements 8+ years of frontend engineering, with fullstack experience. Strong in TypeScript and modern frameworks (React Native, etc.). Skilled in mobile and cross-platform development. Hands-on with WebAuthn, passkeys, and secure authentication flows. Proven record of shipping user-facing products in fintech or onchain. Strong sense of UX, detail-oriented, and committed to reliable code. Clear communicator who works well in fast-moving, collaborative teams. Degreed from a Top World class university. You can demonstrate long tenures in your previous roles and progression (ie promotions) You have worked in both successful start-ups and larger organisations. Benefits Contract : Permanent role (Hybrid remote) in Paris (France) or other EU countries or US (EST times) Remote first company : flexibility to work fully remotely or at an office location of your preference within the European Union. Salary: to 220k USD (or 190 K€) per year on a full-time permanent work contract. Equity: 100-200 stock options vested over 4 years with a one-year cliff. Work essentials: MacBook Pro, iPhone, AirPods, screens, headsets, AirPods, and cables are provided on Day 1 . Training and coursework in Crypto, Blockchain, Security, code, Coding languages and other topics are paid for on-demand to encourage personal and professional growth. Events: fully funded attendance at fintech, blockchain, or related conferences. Teams retreats/meetups/seminars/conferences all around the world to get to meet in-person and foster meaningful connections. Benefits: healthcare and life insurance, retirement plan, sponsored transportation, gym, lunch card, home office equipment, and other perks. Recruitment process : Video call with COO/CTO (30mn). Cognitive and personality tests (45mn). Coding Test in language of your choice Focus interviews : code review/Architecture review/Security fundamentals/culture fit (30mn x 4). Final interview with Management.