Senior Scala Backend Engineer: Blockchain Wallet Backends

Ledger; Paris; Hybride; EUR 95 000 - 130 000; Plein temps

Avantages offerts par ce poste

Hybrid work flexibility

Health insurance

Shareholder opportunities

Commuter allowance

Learning & Development

Résumé du poste

Ledger, headquartered in Paris with a global footprint, is hiring a Senior Scala Backend Engineer for the Cloud Wallet team. You will design and operate Scala services powering wallet accounts and enterprise custody, enabling seamless blockchain backends and on-chain data processing.

You will lead end-to-end integrations, own production quality, define contracts with cross-team partners, review ADRs and help advance our AI tooling and governance practices across the backend stack.

Qualifications

• 5+ years backend engineering with distributed systems experience.
• Production ownership and strong production experience.
• Interest in Scala and functional programming.
• Hands-on blockchain integration across account-based, UTXO or privacy-preserving chains.
• Experience with event-driven data infrastructure and observability tooling.

Responsabilités

• Design, build and operate the Scala services that connect Ledger wallets and Enterprise platform to blockchain backends: account creation, operation history, transaction crafting, broadcast and lifecycle tracking.
• Lead new blockchain integrations end to end, from ADR design to production across multiple chain models.
• Own production quality: SLIs/SLOs, observability, distributed tracing, incident resolution for institutional clients.
• Define contracts with Coin Integration and Ledger Enterprise teams for data flows and states.
• Write and review ADRs, discuss designs, improve code quality and manage technical debt.
• Work in an AI-native way: use coding agents, write specs and verification for safe delivery, contribute to AI tooling.
• Mentor engineers and share knowledge across Backend Blockchain community.

Connaissances

Backend engineering

Distributed systems

Scala

Blockchain integration

Event-driven

Observability

Incident management

TypeScript

AI coding tools

English communication

Outils

PostgreSQL

RabbitMQ

NATS

Datadog

Description du poste

Ledger, headquartered in Paris with a global footprint, is hiring a Senior Scala Backend Engineer for the Cloud Wallet team. You will design and operate Scala services powering wallet accounts and enterprise custody, enabling seamless blockchain backends and on-chain data processing.

You will lead end-to-end integrations, own production quality, define contracts with cross-team partners, review ADRs and help advance our AI tooling and governance practices across the backend stack.