Senior Software Engineer Frontend React/Svelte M/F

DecathlonNordEURESpublished 06/19/2026
Must-have:ReactNode.jsExpressGraphQLGitGoogle CloudDockerKubernetesFrontendAgileMicroservicesE-CommerceSeniorLead
Nice-to-have:CloudMobileSecurity
Machine translation — original language: French.Show original

Our 2nd life team is looking for a Frontend Tech Lead based in Lille.

Our Decathlon Second Life teams, composed of about 60 multi-skilled people (PM, back dev, front dev, mobile dev, QA), are responsible for designing and developing the solutions of tomorrow so that Decathlon can support our customers in more responsible consumption of certified & refurbished sporting goods (purchase and resale).

At the heart of Decathlon's digital transformation, and in a rapidly expanding field, our team is undergoing an ambitious technological and organizational transformation to support customers, as well as all our employees in our stores and warehouses around the world.

As a Senior Software Engineer Frontend, you will join the Web Experience team of our 2ndLife Buyback solutions.

YOUR FUTURE CONTRIBUTION

As a Senior Software Engineer Frontend, you will be integrated into one of our squads consisting of a Product Manager and Developers. Your role is to:

  • Design Web applications and modules that provide seamless user experiences in compliance with current standards.
  • Elaborate the technical roadmap of the products.
  • Make technical and architectural choices that allow for the creation of modular, scalable applications with the capacity to scale up quickly.
  • Guarantee compliance with and the proper evolution of best practices for both Engineering Excellence and Operational Excellence.
  • Guarantee the security and resilience of the application.

TECHNICAL STACK

  • ReactJS, SvelteJS
  • NodeJS, express, GraphQL
  • Microservices architecture, API
  • Docker, GCP, Kubernetes
  • Continuous integration and deployment via github actions

WHAT YOU BRING

  • You have a minimum of 5 years of experience in developing large-scale Web applications (preferably in the Retail sector), in-depth knowledge of RESTful APIs, microservices architectures, and continuous deployment.
  • You have a strong quality mindset (best practices, tests, genericity and reusability, documentation).
  • You know how to be pragmatic and take a step back to judge the relevance of technical choices.
  • You are able to support more junior developers and train them in best practices.
  • You are able to popularize a technical subject to communicate with a wide audience, potentially less technical (leaders / executives).
  • You are comfortable in English, both spoken and written.
  • You have an agile mindset focused on continuous improvement and collective intelligence.
  • You are passionate about technology and love to share and contribute.
  • You are particularly sensitive to the impact of practicing sport for the values it has allowed you to acquire in your interpersonal skills and teamwork!
  • You are passionate about the circular economy and #Tech4Good.

The little extra with us: You join a team where circularity is not just a buzzword, but the engine of our future growth.

WHAT WE OFFER YOU

  • 2 days of teleworking per week;
  • Equipment provided in accordance with your missions and our societal commitments (Mac, Windows, or Chromebooks);
  • A local project team within a global network (possibility of an international career);
  • Skill development and support (diversity of projects, technical certifications from the first year, internal and external training, etc.);
  • Compensation package (employee participation in company shares, monthly/quarterly bonuses).

DECATHLON DIGITAL

Imagine if technology allowed us to push boundaries and offer unprecedented sporting experiences. That is precisely our ambition at Decathlon Digital! We are a team of more than experts in software engineering, product management, data, cloud, and cybersecurity, spread across Paris, Lille, and Amsterdam. Together, we are creating the largest digital sports platform, leveraging technological innovations to optimize the value chain, design connected experiences, and give a second life to our products.

Let's change the game for good. Our passion for sport guides us and we want it to endure. That is why we are committed to building a more sustainable technological model, by reducing n