Senior Backend Engineer – Wallets & Payments

Jobgether; France; Hybrid; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Hybrid and remote options

Competitive compensation

Flexible holidays

Job summary

Ledger in France is seeking a Senior Backend Software Engineer (Ledger – Wallets) to own wallet infrastructure across fiat and cryptocurrency operations. You will design services for the complete wallet lifecycle, ensure reliability, and collaborate across domains to support growing transaction volumes.

You will work with Java/Kotlin and Spring Boot, building scalable, event-driven microservices with strong emphasis on DDD, hexagonal architecture, and robust observability.

Qualifications

• 5+ years backend engineering with Java or Kotlin and Spring Boot.
• Experience building distributed systems with event-driven microservices (Kafka/AWS SQS).
• Hands-on with MySQL or PostgreSQL and Redis.
• Experience wallet/account management systems with lifecycle/state machines.
• Knowledge of DDD and hexagonal architecture; bounded contexts.
• RESTful API design with backward compatibility and good developer experience.
• Observability/production monitoring with Grafana/Prometheus/Micrometer.
• CI/CD, infrastructure-as-code, and modern observability tooling.
• Strong communication across time zones; on-call readiness.
• Proactive ownership and reliability-minded mindset.

Responsibilities

• Design, develop, and maintain wallet infrastructure for fiat and crypto across multiple products.
• Collaborate with cross-functional teams to ensure consistent financial operations.
• Build scalable, hexagonal architecture-based services; optimize performance and scalability.
• Own wallet-related services from design to production, ensuring resilience.
• Participate in on-call rotations and incident response; monitor services in production.
• Write well-tested, maintainable code and clear documentation.
• Contribute to architecture reviews and design proposals; promote simple solutions.
• Drive continuous improvement in performance, reliability, and engineering workflows.

Skills

Java/Kotlin

Spring Boot

Distributed systems

Kafka/AWS SQS

REST APIs

MySQL/PostgreSQL

DDD/Hexagonal

Observability: Grafana/Prometheus/Micr

CI/CD & IaC

On-call ownership

Tools

Grafana

Prometheus

Micrometer

Job description

Ledger in France is seeking a Senior Backend Software Engineer (Ledger – Wallets) to own wallet infrastructure across fiat and cryptocurrency operations. You will design services for the complete wallet lifecycle, ensure reliability, and collaborate across domains to support growing transaction volumes.

You will work with Java/Kotlin and Spring Boot, building scalable, event-driven microservices with strong emphasis on DDD, hexagonal architecture, and robust observability.