Fullstack Developer (Backend Specialist – FastAPI)

The context Since 1976, Decathlon has been on a mission: "Moving People through the Wonders of Sport." Our global family includes 105,000 teammates, 2,000 stores in 70 countries, and 85 product brands. Our Swiss success story began in 2017 with the opening of our very first store in Neuchâtel. Today, we have rapidly grown to 1,500 teammates across 54 stores throughout the country. And we are not stopping there! We are continuously expanding our footprint, particularly in the German-speaking part of Switzerland. In this dynamic environment, our Digital team is evolving. Following a recent reorganization within the IT engineering team, we are creating a new permanent position and looking for a pure developer. If you are looking for a 100% technical role where you can fully immerse yourself in the code and architecture, this newly created role is for you. Our culture: Dare, Test, and Play Together At Decathlon, you are not just executing tasks; you are an intrapreneur. We work in an environment where we love to test, dare, and take decisions. We strongly believe in the "right to make mistakes"—we try, we sometimes fail, we learn, and we grow together. In this position, you will have the the freedom to work with modern stacks (Svelte, FastAPI) in a fast-paced environment (GCP Severless). But beyond the code, we are a team of sports enthusiasts. We regularly share sports sessions together, from lunch-break runs to team outdoor events. Finally, career evolution here is not a myth: joining Decathlon means entering a global network where your career path can evolve according to your desires, whether in Switzerland or internationally. The mission We are looking for a Fullstack Developer with a "Backend-First" mindset to join our engineering team. You will be a key player in architecting and building modern web applications that power our most strategic Swiss initiatives. Your primary focus will be on Python, creating high-performance, reusable component libraries that will serve as the foundation for multiple platforms. Key projects you will tackle Rental solution: Scaling our brand-new platform to make sports equipment more accessible through the circular economy.B2B Platform: Developing professional interfaces for our corporate and club partners.Internal CMS & Tools: Building the "engine room" that empowers our internal teams to manage content and operations efficiently. What You Will Do Architect and Build: Design and implement robust backend architectures using FastAPI.Fullstack Delivery: Maintain and extend our backend services, primarily built as Cloud Functions (GCP) using FastAPI (and occasionally Flask for legacy services).Fullstack Excellence: Develop a library of high-reusable frontend components to ensure UI/UX consistency across all platforms.Collaborate: Work closely with UX/UI designers and product managers to translate complex requirements into elegant technical solutions.Quality: Advocate for best practices in testing, documentation, and performance optimization. Who You Are Technical Requirements: Experience: 3-5 years of professional experience in modern web development.Backend specialist: Python framework (FastAPI / Flask).Cloud Native: Familiarity with Google Cloud Platform (GCP), in particular with these components: Cloud Run, Pub/Sub, CloudSQL : PostgreSQL, Firestore, Bigquery, GCP Logs Explorer, Cloud Scheduler. Serverless architectures (Cloud Functions).Frontend: You are comfortable with Javascript, experience with Svelte(kit) or a similar javascript framework is a significant advantage. Soft Skills Owner mindset: You take pride in the code you ship and the products you build.Collaborative: You thrive in a team environment, value open communication, and actively contribute to collective success. You know that the best products are built through trust, alignment, and shared ownership.Language: Fluency in English is required. Proficiency in French or German is a strong plus for the Swiss market.Sporty: You share our passion for sport ! Note to candidates: Even if you don’t check every single box but are a FastAPI/Svelte enthusiast with a passion for building great products, we want to hear from you! What We Offer Flexibility and time off: A hybrid work policy (2 days of home office per week) and 6 weeks of holidays per year. Because to be performant at work, you need time to disconnect and recharge ;)Salary and Bonus: We value your commitment with a fixed salary and a 13th month. Add to that a monthly bonus (up to 10% of your gross salary) linked to the company's success, plus an annual profit-sharing bonus to reward our collective effort.Shareholding: Once a year, you have the opportunity to invest in Decathlon shares, a great investment as the stock value has been steadily growing for a decade.Your sport at a discount: Enjoy a -25% discount all year round on your Decathlon purchases. We also offer you 225 CHF/year for your sports subscription!Transport and mobility: We participate in your commuting costs with a 400 CHF CFF (SBB) voucher per year, and we boost your transition to sustainable mobility with an additional 25% discount on soft mobility gear. How We Will Meet We believe in an objective and human evaluation. Here are the steps to join us: Your application: No cover letter needed here! Simply send your CV and answer our short questionnaire (mandatory to apply).The Assessment and English test: As soon as you apply, you will receive an email from AssessFirst (don't forget to check your spam folder!). It's a 30-minute maximum questionnaire to help us discover your personality and evaluate your spoken English level. Don't worry, an AI isn't sorting your CV: our teams read every single application and handle the pre-selection! The real plus? You get your results instantly, a great bonus to help you in your job search or future interviews.Interview with Louise, the Talent Acquisition Manager (video call): A first chat for external candidates to discuss your values and our DNA. Are we meant to work together?Interview with Heloy, your future Manager : You will meet your future manager to dive into the role, the tech stack, and concrete challenges.Interview with Andrea, the Digital Leader (your manager's manager): A great opportunity to discuss your strategic vision on a larger scale.Interview with the teammates from the Digital team: A final chat to discuss your future development path, and answer any last questions you might have. Ready to join the team? Apply now and let’s move people through sport together.