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NEXTON

Builds digital projects for large French firms

Senior Java Developer - Microservices & Kafka

Backend EngineeringPosted on Nov 13
Full-timeÎle-de-France, FranceNo salary listedIn-person

About the Job

Requirements

  • A BAC+5 higher-education qualification is required.
  • At least 5 years of experience as a Java backend developer is required.
  • Strong proficiency with recent Java versions and Spring Boot 3+ is required.
  • Production experience with Kafka and familiarity with distributed-architecture concerns are required.
  • Proficiency with PostgreSQL, JPA/Hibernate, and performance optimization is required.
  • Experience with automated testing, Git, and CI/CD tools such as GitLab CI or Jenkins is required.

Responsibilities

  • Design and develop microservices using Java and Spring Boot 3+.
  • Design and expose REST APIs documented with OpenAPI/Swagger.
  • Implement event-driven architecture using Kafka to produce and consume events.
  • Maintain consistency between the database and events using patterns such as Outbox or CQRS.
  • Model and optimize persistence using PostgreSQL and JPA/Hibernate.
  • Analyze and improve performance through profiling and SQL query optimization.
  • Write unit and integration tests using JUnit and Testcontainers.
  • Contribute to CI/CD and service observability using Actuator and OpenTelemetry.

Desired Qualifications

  • Knowledge of Outbox and CQRS patterns, Docker, and OAuth2/OIDC/JWT security is a plus.

About the Company

NEXTON

Builds digital projects for large French firms

NEXTON plans and builds digital projects for large French companies and online businesses, combining digital strategy with software development and marketing. Its teams cover product management, user-experience design, agile delivery and data work, and build websites, mobile applications and customer communications. Clients pay for specialist consultants assigned to their teams or for projects delivered by NEXTON's own agency. The agency combines designers, developers and marketing specialists to handle projects from planning and interface design through development and delivery. Founded in Paris in 2011, NEXTON is headquartered there at 5-7 rue Saint-Fiacre and operates across France.

Company size
Not listed
Company stage
Not listed
Total funding
Not listed
Headquarters
Paris, France
Founded
2011

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