{"@context":"https://schema.org","@type":"JobPosting","title":"Senior Java Engineer - Sport User Intelligence F - M - D H/F

We are looking for talented Senior Software Engineers, based in Lille

Kindly send your resume in english.

At Decathlon, we're passionate about bringing people together and make wellbeing accessible for all.. Our mission is to inspire and enable people to embark on, and enrich their sporting journey, whether they are curious or demanding, beginner or professional. Through innovative product design, sustainability initiatives, and a commitment to customer satisfaction across channels, we aim to revolutionize the way people experience sports.

The Know Your Customer domain is dedicated to building 360° customer insights, driving powerful business levers through an increasingly personalized digital lifecycle. We are currently scaling from local teams to a global organization, spearheading a massive technological transition (Full APIs, Data/Event-Driven Architecture, Microservices, Headless). Operating in 45+ countries with 200 million accounts, we handle 30,000 new sign-ups daily and billions of interactions across channels. Our mission? Delivering the best personalized sport and product recommendations, tailored to each customer's journey and interactions within the Decathlon eco-system

If you're passionate about leveraging technology to enhance the sports experience for hundreds of millions of customers in 70 countries around the world, we want to hear from you.

Are you ready to play?

In this stimulating environment, your role will be to shape the personalization offering of tomorrow, alongside the software that powers it.

• Architecture: Design and evolve microservices (Java 21, SpringBoot 3) ensuring high availability and resilience for global traffic (30k new users/day).
• Collaboration: Collaborate closely with Data Scientists and Engineers to build high-performance APIs that expose personalized recommendations to our customers. Act as a technical multiplier by conducting high-quality code reviews, facilitating knowledge sharing, and mentoring peers without formal management
• Continuous Improvement: Proactively identify and resolve bottlenecks in the code, architecture, or team processes to constantly improve the "Sport User Intelligence" platform.
• Code excellence: Champion software quality by promoting clean code, robust design patterns, and supervising the implementation of TDD to ensure stable deployments.
• DevSecOps Culture: Drive daily production deployments through optimized CI/CD pipelines, enhanced observability , and a "shift-left" approach to security.
• Problem solving: Lead the resolution of complex technical challenges within cross-functional teams, ensuring solutions align with global Decathlon standards.
• Tech Watch: Stay at the forefront of the ecosystem (Event-Driven/Kafka, Cloud-Native/GCP) to prototype and integrate the tools that will power tomorrow's customer experience.

About the Team/Tech

• Global organization with offices in Amsterdam, Paris, Lille and Nantes, providing 70 countries with digital solution
• Backend & architecture: Java 21+, Spring Boot 3+ (Reactive Programming), Microservices, Event-Driven (Kafka).
• Data & intelligence: Airflow, Spark, OpenSearch (powering recommendation engines)
• Cloud & Infrastructure: GCP, Aiven, Docker, Kubernetes (K8S), FluxCD (GitOps).
• Persistence: PostgreSQL, Redis, Datadog.
• Observability: Datadog
• Quality & CI/CD: GitHub, GitHub Actions, SonarCloud, Karate, JMeter.
• Frontend (Admin UI): React, TypeScript.
• Collaboration: Slack, Google Suite, Confluence, Jira.

5+ years of experience as a Java Backend Developer (Spring Boot) in high-scale environments.

• Mastery of Backend Design: Expert in building microservices, RESTful APIs, and event-driven architectures (Kafka).
• Operational Mindset: A "you build it, you run it" approach, with experience in monitoring, alerting, and incident management (RCA).
• Engineering Excellence: Solid experience in CI/CD, TDD, and all testing layers (Unit, Integration, Load Testing).
• Cloud & Infrastructure: Proficient with Kubernetes, Terraform, and GCP, ensuring global scalability and resilience.
• Collaborative Leadership: Ability to dr