Senior Java Engineer — AI-Augmented Backend (CIB Bank) — Paris

A major corporate & investment bank in Paris is scaling its backend engineering. The goal: ship reliable, auditable, production-safe systems for regulated financial workflows — treating AI coding agents as a first-class tool, not a gimmick.

The context

You join a team that doesn't just write code: it engineers the harness around AI agents (Claude Code / Codex) that makes them reliable. Specs first, hooks, AGENTS.md, back-pressure loops, verification gates. A demanding banking environment: audit trail, data security, compliance.

The role

As a Senior Java Engineer, you design and deliver the backend layer of regulated financial workflows, using AI coding agents daily to move faster and ship better.

• Spring Boot 3.x microservices (Java 21: virtual threads, records, sealed classes)
• Robust REST APIs: Spring MVC, Spring Security, Spring Data JPA, fine-grained transactions
• Spec-Driven Development: spec → generated skeleton → tests first → agent completes the implementation
• Harness engineering: AGENTS.md, pre-commit hooks, typecheck back-pressure, planner/evaluator splits
• Java MCP servers exposing internal APIs to the agents
• Observability (OpenTelemetry, ELK/Loki, Prometheus → Grafana) and Kubernetes deployment

What we're looking for

• 5+ years of Java in production (Java 17 min, Java 21 a plus)
• Spring Boot 3.x: auto-configuration, profiles, actuator, security, batch
• Modern Java: records, pattern matching, sealed classes, virtual threads
• You use Claude Code / Codex daily and think in specs before code
• Testing: JUnit 5, Testcontainers, Mockito, contract & mutation testing
• Event-driven stack (Spring Kafka, WebFlux, R2DBC), Kubernetes & Docker, CI/CD
• Banking / insurance background appreciated; French + technical English

Terms

• Permanent contract — competitive compensation based on profile
• Paris — on-site / hybrid; start as soon as possible
• High-impact enterprise mission in a regulated environment