Application Development

As a Senior Backend Java Engineer, your mission will be to design, implement and maintain robust backend services within a modern microservices architecture, while ensuring high quality, security and compliance with architectural standards.

• Designing and implementing RESTful microservices using Java (LTS) and Quarkus, in line with Twelve-Factor App principles.
• Developing secure, scalable and resilient backend services handling complex business processes (registrations, VAT declarations, validations, workflows, batch processing, notifications and asynchronous treatments).
• Implementing backend components strictly based on functional specifications provided by business analysts (APIs, data models, business rules, validations and RFC 9457 error cases), while ensuring technical consistency and robustness.
• Collaborating closely with the internal architect to ensure full alignment with defined architectural guidelines, transversal standards (logging, auditing, error handling, security) and the progressive application refactoring roadmap.
• Building and maintaining inter-system integrations, including internal APIs and external systems (e.g. SAP, MyGuichet), notably through SOAP service consumption and asynchronous messaging.
• Delivering high-quality, production-ready code by applying best practices, contributing actively to code reviews, and ensuring strong unit and integration test coverage.

Technical Skills

• Strong expertise in backend development with Java (17+) and Quarkus, including REST APIs (JAX-RS, RESTEasy), OpenAPI 3, JSON-B/JSON-P and messaging systems such as RabbitMQ.
• Solid experience with microservices architecture, containerization (Docker) and Kubernetes/OpenShift environments, including configuration, monitoring, logging (Splunk) and CI/CD pipelines.
• Proven ability to work with complex data environments, including PostgreSQL and legacy DB2 z/OS, as well as integrating external systems via SOAP, messaging and asynchronous flows.

Soft Skills

• Strong analytical mindset with the ability to quickly understand complex business domains and translate requirements into clean, maintainable backend solutions.
• Clear communication and effective collaboration with architects, business analysts, tech leads and cross-functional teams in a demanding technical environment.
• High level of rigor, autonomy and reliability, with the ability to adapt to an evolving context combining legacy systems and modern microservices.