Senior Backend Engineer

The role

You will design, build, and operate Scala services that connect Ledger wallets and the Enterprise platform to blockchain backends. You will lead blockchain integrations, own production quality, and mentor other engineers.

What you will do

• Design, build and operate Scala services for account creation, operation history, transaction crafting, broadcast and lifecycle tracking
• Lead new blockchain integrations end to end from design to production
• Own production quality including SLIs, SLOs, observability, and distributed tracing
• Take part in the firefighting rotation and drive incidents to resolution
• Define clear contracts with the Coin Integration and Ledger Enterprise teams
• Write and review ADRs, challenge designs, and manage technical debt
• Work in an AI-native way using coding agents and contributing to AI tooling
• Mentor other engineers and share knowledge across the Backend Blockchain community

Required qualifications

• 5+ years of backend engineering with real production ownership of distributed systems
• Strong production experience
• Hands-on blockchain integration experience on at least two models among account-based, UTXO and privacy-preserving chains
• Experience with event-driven systems and data infrastructure (PostgreSQL, RabbitMQ, NATS or equivalent)
• Experience with observability tooling (Datadog or equivalent)
• Able to diagnose an incident across several services and own the outcome
• Comfortable reading and contributing to TypeScript code
• Daily use of AI coding tools
• Clear written communication in English

Nice to have

• Interest for Scala and functional programming practice

Benefits

• Flexible work options - hybrid policy allows working from home up to 3 times per week
• Health & Wellness support - Health and Life Insurance
• Financial growth opportunities - Employees can become shareholders in Ledger and other financial benefits depending on country
• Commuter allowance
• Learning & Development - comprehensive suite of training solutions

About the company

Ledger is a global platform for digital assets and Web3 with over 20% of the world's crypto assets secured through their devices. The company has its headquarters in Paris and a team of around 600 professionals.