Backend Engineer - Blockchain Application

Ledger: Making Digital Assets Accessible and Secure for Everyone

Join the mission!

Founded in 2014, Ledger is the global platform for digital assets and Web3. Over 20% 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 more than 700 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 6 million units already sold in 200 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.

Ledger is looking for a Backend Engineer to join our team. You will be responsible for developing and scaling a backend application to allow big financial institutions to process their transactions in the cryptocurrency world.

The Ledger Vault

The Ledger Vault is a SaaS solution addressing the need to safeguard very large and diversified amounts of cryptocurrencies while mitigating both IT and physical assault threats. This enterprise-grade solution’s security is based on "HSM" (Hardware Security Module) and hardware authenticators. It is a turnkey SaaS hardware/software suite enabling handling multiple cryptocurrencies through advanced governance rules such as multi-authorization, rate-limiting, and time-locking.

We are looking for talents to build a solid and scalable platform for the BtoB financial market.

Your Mission

  • Design and develop our governance and orchestration layer; and a set of complex APIs
  • Communicate with cryptographic modules (HSM), and blockchain interfaces
  • Integrate new cryptocurrencies on Vault
  • Work closely with the Product team to define and understand end-user requirements, and translate them into pragmatic technical solutions
  • Work in a cross-team environment: You will be in direct contact with Vault’s Frontend and QA engineers, but also with cross-functional teams such as Core, Firmware, Infrastructure, and Operations
  • Participate in firefighting sessions, and interface with stakeholders like Technical Account Managers

What We’re Looking For

  • 5+ years of experience in Backend / Software Engineering role, preferably in a product-based startup environment
  • 3+ years of experience in Python as the primary language (Flask, FastAPI)
  • Capable of self-training on backend languages like Scala / C++ / NodeJS
  • Familiarity with software development best practices - version-control, code-reviews, testing, CI/CD
  • Work in an agile environment (Scrum/XP/Kanban)
  • Work in a multicultural environment - English is a MUST

Bonus Points

  • You have a sound knowledge of RESTful API design, standards, and best practices
  • You have an interest in other API frameworks (e.g. GraphQL), and dabble in message-based systems
  • You are keen to step outside your area of expertise and contribute to all parts of a product
  • You have an interest in cryptocurrencies and blockchain technology
  • You are active in the open-source community, speak at conferences, attend meetups, write blogs, contribute code, etc.

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.

#LI-HG #LI-Hybrid

Skills

Backend
C++
FastAPI
Flask
GraphQL
NodeJS
Python
Scala
Others
Blockchain
Security
Vault
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