Senior Front-end Engineer - Platform

About Ledger We’re a team of experts pushing the limits of what’s possible, united by our common goal to unlock true freedom through digital ownership, making technology accessible for all. We believe in a world where users, creators and enterprises manage their value with ownership and freedom. Our curiosity drives us to innovate, empowering individuals on a global scale. We believe change is constant and our team moves forward as one, with a culture of problem-solving where every employee is empowered and supported to challenge tradition and create solutions. Our mission is simple: to make self-custody accessible and give people the keys to their own financial futures. If you want to make a true impact, we want you to join us at Ledger. At Ledger, we’re proud to be the global platform for digital assets and Web3, with over 20% of the world’s crypto assets secured through our Ledger devices. With our headquarters in Paris, and offices in Vierzon, Grenoble, Montpellier, London, Portland, Geneva, Zurich and Central Singapore, we have a team of around 600 professionals developing a variety of products and services to enable individuals and companies to securely buy, store, swap, grow and manage crypto assets – including the Ledger hardware wallets line with more than 7.5 millions units already sold in 200 countries. The team: Ledger Wallet is our flagship application, built on a Open Source monorepo using React, Electron (Desktop), and React Native (Mobile). It supports multiple blockchains and integrates numerous D Apps. You will join the Platform Team, a transverse unit responsible for the "skeleton" and infrastructure of Ledger Wallet. We don’t just build features, we build the foundation that allows other feature teams to ship faster and safer. We are looking for a Senior Engineer to help own the tech stack, improve our monorepo architecture, and drive the transition toward micro-frontends. You will treat "other developers" as your primary customers, focusing on tooling, build speed, and Developer Experience (DX). What you’ll be doing: - Architecture & Monorepo Management: Set and uphold the engineering standards for our large-scale monorepo, Ledger Wallet. Drive improvements in dependency management, build performance, and structural organization so the codebase scales cleanly with dozens of contributors. - Micro-Frontends & Scalability: Work on shaping the technical strategy for decoupling our architecture by architecting automated CI/CD workflows and micro-frontend approaches that enable independent team deployments on both Mobile and Desktop Platforms. - Developer Experience (DX): Design and build internal tooling, scripts, and CLIs that remove friction for other developers. If a process is slow or manual, your job is to automate it. - Tech Stack Governance: Maintain the health of our core stack (React, React Native, Electron, TypeScript). Handle upgrades, minimize technical debt, and enforce best practices across the organization. - Mentorship & Advocacy: Act as a technical referent. Promote engineering standards, conduct high-level code reviews. What we’re looking for: - Experience: 6+ years in software development with significant experience in complex Frontend architectures. - Stack Mastery: Deep proficiency in TypeScript and React. You understand how React works under the hood (reconciliation, rendering, performance). - Platform Mindset: Proven experience managing Monorepos (using tools like Nx, Turborepo, Lerna, or similar) and configuring build tools (Webpack, Rspack, ESBuild, Metro, Re.Pack). - Mobile & Desktop: Experience with React Native and/or Electron is highly critical for this role, as you will impact both platforms. - Architecture: Practical experience implementing Micro-frontends or modular architectures at scale. - CI/CD Ops: Familiarity with configuring pipelines (GitHub Actions, CircleCI) and optimizing build/test parallelization. - Soft Skills: You are empathetic to the struggles of other developers and have a "service-oriented" mindset toward internal teams. Nice to have: - Experience with native modules in React Native. - Experience in Web3 topics and technical stacks. - Active contributor to Open Source projects. At Ledger, we are dedicated to continually investing in our employees which is why we offer more than just salaries; we provide comprehensive compensation packages that include a wide range of benefits. Here are some of the benefits you can look forward to: - Flexible work options - Our hybrid policy allows employees to work from home up to 3 times per week - Health & Wellness support - Health and Life Insurance. - Financial growth opportunities - Employees can become shareholders in Ledger as well as other financial benefits depending on your country of work. - Commuter allowance - Ledger offers a commuter allowance to contribute to your preferred means of transportation. - Learning & Development - A comprehensive suite of training solutions providing a personalised learning experience for every employee. For regionally specific benefits, your Talent Acquisition contact will be able to provide you with more information. We’re committed to building an inclusive hiring process. If you need any adjustments or accommodations, just let us know, we’ll do our best to support you.