Senior Javascript Software Engineer - Ledger Live


Senior Javascript Software Engineer - Ledger Live

  • Permanent contract 
  • Montpellier

The company



  • FinTech / InsurTech, Blockchain, Cyber Security
  • From 250 to 2000 employees

The job

Senior Javascript Software Engineer - Ledger Live

  • Permanent contract 
  • Montpellier

Who are they?

Founded in 2014, Ledger is the global leader of security solutions and infrastructure for cryptocurrencies and blockchain applications, with more than 4 million users in 180 countries.

Ledger combines hardware and software expertise to secure billions of dollars worth of almost 2,000 different crypto assets - worldwide, 15% of these assets are managed through the Ledger ecosystem.

Bolstered by accelerated growth (with revenue growing by 6 times between the first semesters of 2020 and 2021), and a new fundraiser that made Ledger a “unicorn” worth 1.5 billion dollars, Ledger will be a major player in the fourth industrial revolution - the revolution of the Internet of Value, Web3, DeFi, and NFTs.

Ledger designs the most reliable and user-friendly solutions: their R&D team created an operating system, integrated into the Nano S and X, and a platform, Ledger Live, that allows users to take back control of their digital lives by acting as a secure gateway to the entire ecosystem of digital assets. Ledger has already welcomed more than 330 people in 2021 - and they’re just getting started. Based in Paris, Vierzon, Singapore, New York, London, Geneva, Montpellier and Grenoble, upon arriving at Ledger employees sign a “P.A.C.T” of values: Pragmatism, Audacity, Commitment, Transparency and Trust

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Job description

Ledger is a leader in security and infrastructure solutions for cryptocurrencies and blockchain applications.

We develop hardware wallets, a physical key to keep your crypto assets safe – Ledger Live is the central software we deliver to our users to manage it and track their cryptocurrency portfolio.

Ledger Live team, at Ledger, provides a bridge between their hardware key and the blockchain to offer a unified experience.

Ledger live is Community Driven product with 200k+ monthly users.

All our software products have an aspect of integration with our hardware wallets.

Our engineers interact on a daily basis with hardware, security, crypto, design teams to build the best new generation products.

What you will do ?

  • You join Ledger Live engineering team to maintain and develop on Ledger Live stack, involving Ledger Live apps (mobile and desktop) and its ecosystem
  • You maintain and develop new ideas around it on existing and future tooling projects (example: automated testing of crypto transactions with a bot, command line interface, internal/external tooling)
  • Your work involves working 100% on Open Source projects: ledger-live-mobile, ledger-live-desktop as well as ledger-live-common (business logic) and ledgerjs (hardware communication)
  • Helping our QA team to automate even more our testing approaches
  • Be involved in investigating bugs in the complex world of blockchains edge cases
  • Requirements

  • Engineer profile with at least 8 years of experience in Software development
  • You have a strong background/interest in algorithm development and optimization to work on our stack: work with device in binary, work with blockchain technologies, ...
  • You have a good knowledge of JavaScript and are comfortable working with type systems (TypeScript / Flowtype)
  • You have a good knowledge of DOM / CSS and UI libraries like React
  • You are curious to learn how blockchain works under the hood and investigate deeply complex systems
  • Nice to have: functional programming, experience in GraphQL, open source experience
  • What our tech stack looks like ?

  • Language: ES7+ JavaScript (with FlowType and TypeScript)
  • UI done with Electron and React (desktop) and React Native (mobile) – and its ecosystem (e.g. redux, react-navigation)
  • Interact with hardware devices with async and observable paradigm using RxJS
  • We are full stack: from business logic of blockchain to the hardware wallets
  • Benefits

  • Competitive compensation package, and and ESOP according to the Company policy
  • Flexible working hours, remote friendly environment
  • Strong focus on personal development, including internal and external trainings, and attendance to conferences
  • Internal talks, technical meetups, and hackathons
  • High performance equipment for your work
  • 5 weeks of paid vacation + 10 days of RTT
  • Comprehensive health insurance with medical, dental, and vision coverage
  • Meal Vouchers with Swile (ex Lunchr)
  • Reimbursement for sports and cultural activities
  • Annual company outing for Ledgerdary Days, plus frequent parties, snacks and drinks
  • Employee discount on Ledger products
  • Ledger guarantees equal opportunity for all during the recruitment process, without any distinction of gender, ethnicity, religion, sexual orientation, social status, disability or age



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