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Senior Java Engineer - Sport User Intelligence (f/m/d)

Lille, Upline, Nord, France; Paris, Paris, France

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

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.

What you bring

  • 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 drive projects across teams and mentor peers through high-quality code reviews.
  • Plus: A keen interest in the Data stack or basic knowledge of React for internal UI tools.

What we offer

  • Hybrid Work: 2 days of remote work per week.
  • Location: Based in our vibrant Decathlon Digital hub in Lille.
  • Gear: High-end equipment (Mac or Windows) provided in line with our societal commitments.
  • Global Network: A local project team within a worldwide network (offering international career opportunities).
  • Growth: Continuous skill development and support (diverse projects, technical certifications in your first year, internal/external training).
  • Rewards: Competitive compensation package (employee profit-sharing, monthly/quarterly bonuses).

 

DECATHLON DIGITAL CONTEXT 

What if technology allowed us to push the boundaries and take sports experiences to new levels? That's exactly our goal at Decathlon Digital! We are a team of 5,000+ experts in software engineering, product management, data, cloud, and cybersecurity, distributed across Paris, Lille, and Amsterdam. Together, we are creating the largest digital sports platform, leveraging tech innovation from design to value chain optimization, connected experiences and product second life.


Changing the game for good. We are in this for the love of sports. And like everything we love, we want it to last. That’s why we are embarking on a journey to create a more sustainable tech model, reducing our direct environmental impact while maintaining a safe, diverse, and inclusive space for all our people to learn and thrive together. Team up with us to design the digital future of sports.

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  • Vous disposez également du droit de demander leur portabilité.
  • Vous pouvez accéder à ces droits en cliquant ici.
  • Par ailleurs, vous pouvez également consulter notre politique de confidentialité pour plus d'informations sur les traitements effectués.

 

GDPR : When you apply to a job on this site, the personal data contained in your application will be collected by Decathlon SE, (“Controller”), which is located at 4 Boulevard de Mons 59650 Villeneuve d'Ascq.  Your personal data will be processed for the purposes of managing Controller’s recruitment related activities. Your personal data will be retained by Controller as long as Controller determines it is necessary to evaluate your application for employment but for no longer than 2 years. 

 

  • You have the right to request access to your personal data, to request that your personal data be rectified or erased, and to request that processing of your personal data be restricted.
  • You also have the right to data portability. You can request these rights by clicking here. 
  • In addition, you can also visit our privacy policy for more information on the processing carried out.

 

Diversity & non discrimination policy / Politique de diversité et de non discrimination

As part of our diversity and non-discrimination policy, Decathlon Digital wants to ensure that gender, disability, or age of our candidates are not a factor in our decision. If you wish, we suggest that you provide us with this information. This data will be anonymized and used in the macro analysis of the diversity of applications received. This information will be kept separate from your application and will have no effect on its processing.

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Dans le cadre de sa politique de diversité et de non discrimination, Decathlon Digital souhaite s'assurer que le genre, le handicap, ou l'âge de nos candidat·e·s ne sont pas des facteurs de décision. Si tu le souhaites, nous te proposons de nous indiquer ces informations. Ces données seront anonymisées et utilisées dans l'analyse macro de la diversité des candidatures reçues. Ces informations seront séparées de ta candidature et n'auront donc aucun effet sur le traitement de celle-ci.

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