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  "job_title": "Junior Data scientist",
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  "job_description": "The Circularity team is looking for a Data Science/Engineering intern based in Lille.\n\nAt Decathlon, we are over 100,000 sports enthusiasts united by one mission:\nmaking sport and wellbeing accessible to all. What sets us apart is our integrated model:\nfrom R&D to logistics, we manage everything in-house to positively impact the lives of a billion people.\nCONTEXT\n\nThe Circularity Domain In line with the Paris Agreement, Decathlon is making circularity the new norm. We are building a future where recycling, repairing, renting, and buying second-hand is as natural as buying new. We are decarbonizing our model to protect our shared playground.\n\nThe Planet Analytics/AI Team (PLANT) At the heart of the Circularity Domain, our team creates the intelligence that drives Decathlon's sustainable transformation. We turn raw data into concrete actions (dashboards, predictive and prescriptive Machine Learning models) to improve the business and protect the planet.\n\nThe AiGenda Project Our workshop technicians work in a dynamic and complex environment. Between diagnosing a bike, managing spare parts, and welcoming customers, they face constant dilemmas:\nhow to minimize wait times while managing limited capacity? How to prioritize emergencies without breaking overall efficiency? AiGenda aims to automate these complex scheduling tasks. The goal:\nrecommend the best return dates, manage inventory, and prioritize tasks so technicians can focus on their core craft:\nhigh-quality repair.\nYOUR MISSION\n\nEvery optimization begins with creating a model faithful to reality. Your goal will be to contribute to the AiGenda project by building a \"digital twin\" of Decathlon's workshops, capable of adapting to a wide variety of situations.\n\nYour main challenges:\n• Modeling:\nUse Markov Decision Processes (MDP) for complex decision problems and Discrete-Event Simulation (DES) for concurrent events.\n• Development:\nImprove the current prototype based on SimPy + Gymnasium.\n• Robustness & Visualization:\nIntegrate visualizations (via Simbala) and strengthen the current implementation to make it more robust.\n• Reality Check:\nValidate the model against field reality and define the right performance metrics.\n• Optimization:\nWork on \"Generalized Assignment Problem\" type challenges.\nYOUR PROFILE\n\nIf you love solving algorithmic puzzles and see code as a playground, you've come to the right place.\n\nThis internship is for you if:\n• From Theory to Practice:\nYou have a strong grasp of abstract mathematical concepts and know how to transform them into elegant, high-performance Python code.\n• Software Craftsmanship:\nFor you, code that just \"works\" isn't enough. You apply SOLID principles and are committed to writing clean, tested, and maintainable code.\n• Analytical Mindset:\nDebugging and profiling your code is second nature to you, allowing you to iterate quickly and effectively.\n• Visual Storytelling:\nYou know how to design clear visualizations and animations to make complex models understandable to everyone.\n• Soft Skills:\nYou are creative, humble, and not afraid to question your assumptions to keep progressing.\n\nYour background:\n• Master 1 or 2 student (Computer Science, Operations Research, or Applied Mathematics).\n\nOur technical environment:\n• Python Master:\nData structures, OOP (classes), Simpy, and visualization (Plotly / Matplotlib).\n• Testing & Quality:\nPytest, Unittest, and ideally the Hypothesis library.\n• Versioning:\nGit is your daily tool.\n• The \"Little Extra\":\nBasic knowledge in Tableau for dashboarding.\nWHY JOIN US?\n• Sport & Community:\nYou will work in a vibrant workplace that encourages sports practice and team-building moments with your fellow teammates.\n• Brand Ambassador:\nYou will have the chance to test new Decathlon products and share your passion on the field by joining our internal sports clubs.\n• Join a supportive community of interns and apprentice students:\ncollaboration, conviviality, and dedicated events.\n• Learning Culture:\nYou are joining a Happy Trainees 2025 certified company, recognized for providing a high-quality learning environment for interns.\n• Work Tools:\nChoice of hardware (Mac or Windows) provided in line with your missions and our social responsibility commitments.\n• Commuting:\n50% reimbursement of your public transportation pass.\n\nDECATHLON DIGITAL CONTEXT\n\nWhat 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.\n\nChanging 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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