Senior Backend Engineer

Ledger is looking for a Senior Scala Backend Engineer to join the Cloud Wallet team. The team builds and operates the backend services that power blockchain account management, transaction processing and on-chain data aggregation across all Ledger wallet surfaces, from Ledger Live to Ledger Enterprise, the custody platform used by financial institutions. The team believes in the power of functional programming to build robust and scalable platforms.

Responsibilities

Design, build and operate the Scala services that connect Ledger wallets and the Ledger Enterprise platform to blockchain backends: account creation, operation history, transaction crafting, broadcast and lifecycle tracking; Lead new blockchain integrations end to end, from the integration design (ADR) to production, across account-based, UTXO and privacy-preserving chains; Own production quality on your scope: SLIs and SLOs, observability, distributed tracing; Take part in the firefighting rotation and drive incidents to resolution, including those raised by institutional clients; Define clear contracts with the Coin Integration and Ledger Enterprise teams; Write and review ADRs, challenge designs, and raise the bar on code quality, testing (including end-to-end on testnets) and technical debt management; Work in an AI-native way: use coding agents daily, write the specifications, constraints and verification that let them deliver safely, and contribute to the team's AI tooling; Mentor other engineers and share your knowledge across the Backend Blockchain community

Requirements

5+ years of backend engineering, with real production ownership of distributed systems; Strong production experience; Interest for Scala and functional programming practice; Hands-on blockchain integration experience: transaction lifecycle, fees, finality, reorgs, 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) and with observability tooling (Datadog or equivalent); Able to diagnose an incident across several services and own the outcome, from root cause to fix in production; Comfortable reading and contributing to TypeScript code, as the team works on a polyglot stack; Daily use of AI coding tools, with a critical eye on their output; Clear written communication in English, especially for design documents and incident reports

Benefits

Flexible work options: hybrid policy allowing employees to work from home up to 3 times per week; Health and Life Insurance; Financial growth opportunities: employees can become shareholders in Ledger and receive other financial benefits depending on country of work; Commuter allowance; Learning & Development: comprehensive suite of training solutions with a personalised learning experience