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Senior Backend Engineer - Blockchain Application

Alarm Full Time

Job Description

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 15% 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 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.

Ledger 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
  • 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 or Django)
  • 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.
  • Ledger


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

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    Founded in 2016, serves more than 50 million customers and is the world's fastest growing global cryptocurrency platform. Our vision is simple: Cryptocurrency in Every Wallet™. Built on a foundation of security, privacy, and compliance, is committed to accelerating the adoption of cryptocurrency through innovation and empowering the next generation of builders, creators, and entrepreneurs to develop a fairer and more equitable digital ecosystem.

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  • Able to support applications on Linux environment and cloud computing
  • Familiar with modern deployments using CI/CD
  • Familiar with operations under Linux environment
  • Understanding of FIX protocols is a plus
  • Understanding of AWS / Kubernetes is a plus
  • Coordinate between product and development teams to ensure effective delivery of supporting services to the end-user
  • Stay abreast of the latest technology and trends
  • Requirements for the role

  • A strong interest in working in technology and/or financial environments.
  • 5+ years of experience in application support or application development.
  • 1 year+ experience to support an exchange / high frequency / low latency trading system.
  • Experience in Database query, Shellscript; basic Linux command.
  • Minimum 2+ years experience administering multiple monitoring systems such as Datadog, NewRelic, Kubernetes, Grafana and  Elastic Cloud Strong Experience with Cloud Computing, AWS, Microservices Architecture, Unix and Linux Systems
  • Experience coding in Ruby, Python, Java and/or GoLang
  • Help in setting up the support model with the team in long term.
  • Excellent communication and interpersonal skills.
  • A problem solver with a keen eye for detail.
  • Provide phone or remote support during non-office hours if required.
  • Experience with third-party IT support ticketing systems is a plus.
  • Knowledge of Redis, Relational databases and log queries is also a plus