Senior Typescript Engineer (Device / SDK) - FinTech / Crypto

Incubly supports tech companies and startups in scaling their teams and boosting product development, testing, and deployment. They are working with a French company that is a leader in security and infrastructure solutions for cryptocurrencies and blockchain applications, with a team of over 400 professionals developing products including hardware wallets.

• At least 5 years of experience in software development, including experience in a Tech Lead role
• Curious mindset and positive attitude, able to thrive in a highly collaborative environment
• Strong proficiency in JavaScript and TypeScript
• Professional fluency in English

Nice to have:

• Experience with Functional Reactive Programming (e.g. RxJS)
• Experience working with devices using APDU commands, messaging protocols, and blockchain technologies
• Experience with Bluetooth or HID communication
• Previous experience working with embedded systems
• Open-source contribution experience
• Strong understanding of SOLID principles
• Experience with Clean Architecture
• Experience with GitHub Actions or similar CI/CD tools

• Develop and maintain the Ledger Live stack across mobile and desktop applications and its broader ecosystem at Ledger
• Contribute 100% to open-source projects within the monorepo ledger-live
• Support modularization efforts by contributing to the Device Management Kit for internal and external usage
• Maintain and enhance the @ledgerhq/hw-transport-* libraries for secure communication with hardware wallets across multiple channels (U2F, HID, WebUSB, Bluetooth) and platforms (Web, Node, Electron, React Native)
• Contribute to strategic initiatives such as Clear Sign
• Develop and improve the My Ledger section for firmware updates and app installation on devices
• Collaborate closely with Firmware, Product, and other engineering teams
• Partner with QA to automate and strengthen testing processes
• Investigate and resolve complex blockchain-related edge cases and bugs