Backend Engineer - Vault @Ledger


Paris, France

Full time


Dec 2

This job is no longer accepting applications.

Ledger – a technology leader in digital asset and crypto-security solutions – is looking for a Backend Engineer. 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 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 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 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.


  • 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.
  • 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.


  • Competitive compensation package, and BSPCE / Share warrants for entrepreneurs options in Series B (2018) startup.
  • 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 infrequent parties, snacks and drinks.
  • Employee discount on Ledger products.

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