Senior Scala Backend Engineer Blockchain Wallet Systems

INKcredible Design & Printing; Paris; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Flexible work options

Health and Life Insurance

Shareholder opportunities

Commuter allowance

Learning and Development

Job summary

Ledger is the global platform for digital assets. We build and operate backend services powering wallet management, transactions, and on-chain data across Ledger Live and Ledger Enterprise.

This Senior Scala Backend Engineer role focuses on scalable, robust services with a strong emphasis on functional programming. You will collaborate across teams to integrate new blockchains, ensure production readiness, and contribute to AI tooling and incident response.

Qualifications

• 5+ years of backend engineering with distributed systems ownership.
• Strong production experience in live services.
• Interest in Scala and functional programming.
• Hands-on blockchain integration across account-based, UTXO or privacy-preserving chains.
• Experience with event-driven systems and observability tooling.
• Clear written English for design docs and incident reports.

Responsibilities

• Design, build and operate the Scala services that connect Ledger wallets and the Ledger Enterprise platform to blockchain backends.
• Lead new blockchain integrations end to end, from design to production across multiple chain models.
• Own production quality: SLIs/SLOs, observability, tracing; participate in firefighting rotations and incidents.
• Define contracts with Coin Integration and Ledger Enterprise teams for state exposure.
• Write/review ADRs, challenge designs, improve code quality and testing.
• Work with AI tools daily, specify constraints for agents and verification.
• Mentor engineers and share knowledge across Backend Blockchain community.

Skills

Scala

Functional programming

Distributed systems

Backend engineering

Observability

AI coding tools

Tools

PostgreSQL

RabbitMQ

NATS

Datadog

Job description

Ledger is the global platform for digital assets. We build and operate backend services powering wallet management, transactions, and on-chain data across Ledger Live and Ledger Enterprise.

This Senior Scala Backend Engineer role focuses on scalable, robust services with a strong emphasis on functional programming. You will collaborate across teams to integrate new blockchains, ensure production readiness, and contribute to AI tooling and incident response.