Senior Front-end Device SDK Engineer



Software Engineering
Montpellier, France
Posted on Saturday, March 9, 2024
We're making the world of digital assets accessible and secure for everyone. Join the mission.
Founded in 2014, Ledger is the global platform for digital assets and Web3. Over 25% of the world’s crypto assets are secured through our Ledger Nanos. Headquartered in Paris and Vierzon, with offices in the UK, US, Switzerland and Singapore, Ledger has a team of almost 1000 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 5 millions units already sold in 180 countries.
At Ledger, we embody the values that make us unique: Pragmatism, Audacity, Commitment, Trust and Transparency. Have a look at our Origins video here.
The “Device Experience” team is looking for a Typescript developer to enforce
the team. You will join a team of 6 developers + the team lead. Device experience scope is composed of 2 main projects.
Ledger Live which is an application that allow our customer to interact with our
hardware wallets. This app exist for mobile (react-native) and desktop (react inside electron). Device SDK which is a new project in Ledger that aim to deliver to every partner in the web3 ecosystem an easy integration with our device.

Missions :

  • You join Ledger Live engineering team to maintain and develop on Ledger
  • Live stack involving Ledger Live apps (mobile and desktop) and its ecosystem,
  • Your work involves working 100% on Open Source projects all gathered in our monorepo: ledger-live.
  • You participate to our modularization effort by contributing to our upcoming
  • Device SDK, intended for both internal and external usage
  • You maintain and extend our @ledgerhq/hw-transport-* libraries that implement communication protocol with Ledger hardware wallet devices through many communication channels (U2F, HID, WebUSB, Bluetooth,...) and platforms (Web, Node, Electron, React Native,...),
  • You contribute to “My Ledger” section on Ledger Live application where users can update their devices’ firmware and install applications,
  • You collaborate closely with other engineering teams like the Firmware team as well as your Product team
  • You help our QA team to automate even more our testing approaches,
  • You hunt bugs: Be involved in investigating bugs in the complex world of blockchains edge cases.

What we're looking for :

  • Engineer profile with at least 4 years of experience in software development and a tech lead experience,
  • A curious mind with a positive attitude to join a highly collaborative team
  • Proficient with JavaScript and TypeScript,
  • Strong background/interest in algorithm development and optimization to work on our stack: work with devices using APDU, messages, work with blockchain technologies, etc.,
  • Excellent knowledge of React and hooks,
  • Nice to have:
  • Functional reactive programming (RxJS)
  • Experience with bluetooth or HID communication,
  • Previous experience working with embedded systems,
  • Open source experience.
  • SOLID principles understanding
  • Clean architecture experience
  • Github actions (or similar) experience

What's in it for you ?

  • Equity: Employees are the foundation of our success, and we award stock options so you can share in that success as we grow.
  • Flexibility: A hybrid work policy.
  • Social: Annual company outing for Ledgerdary Days, plus frequent social events, snacks and drinks.
  • Medical: Comprehensive health insurance policy offering extensive medical, dental and vision care coverage.
  • Well-being: Personal development, coaching & fitness with our dedicated partners.
  • Vacation: Five weeks of paid leave per year, in addition to national holidays and rest & relaxation (RTT) days.
  • High tech: Access to high performance office equipment and gadgets, including Apple products.
  • Transport: Ledger reimburses part of your preferred means of transportation .
  • Discounts: Employee discount on all our products.
We are an equal opportunity employer for all without any distinction of gender, ethnicity, religion, sexual orientation, social status, disability or age.