Key Account Marketplace Intern

🚀 Key Account Marketplace Intern - Decathlon Marketplace Belgium🌍 About the RoleJoin Decathlon Marketplace Belgium and discover how we bring hundreds of sport brands together on one platform to reach millions of Decathlon customers.As part of the Key Account Management team, you’ll support the Partner Success Managers in developing and growing our partner, brands from onboarding to performance optimization and international expansion.This internship is a unique opportunity to understand the business mechanics behind a fast-growing marketplace, work with real data, and collaborate with diverse stakeholders across Europe.🎯 Your MissionAs a Marketplace Intern, you’ll actively contribute to the daily management of our partner portfolio and the continuous improvement of their performance on Decathlon Marketplace.Your responsibilities will include:Partner Performance Tracking: Analyze key metrics (sales, GMV, delivery quality, conversion, satisfaction) and share actionable insights with the KAM team.Operational Support: Help manage seller accounts via our Mirakl back office (product listings, pricing, shipping rules, content quality).Data Analysis: Build reports and dashboards (in Google Sheets / Excel) to monitor results, trends, and opportunities.Project Contribution: Support initiatives such as Showrooming (in-store marketplace visibility), Brand Deals, Duplication to other EU marketplaces, or EPR compliance.Cross-Team Collaboration: Work closely with logistics, content, and commercial teams to ensure the best partner and customer experience.🧠 Your ProfileStudent in Business, Marketing, Digital, or Data Analytics (Bachelor’s or Master’s).Curious, structured, and data-driven, with a strong interest in e-commerce and digital strategy.Comfortable using Excel / Google Sheets (pivot tables, formulas).Languages: French & English fluent, Dutch is a strong plus.Proactive, organized, and eager to learn in a dynamic environment.💪 What You’ll LearnHow a Marketplace business model operates from the inside.How to analyze performance and drive growth for partner brands.The daily tools of an Account Manager (Mirakl, Pipedrive, Tableau, Google Sheets).How to collaborate cross-functionally in an international retail group.📅 Internship DetailsStart: January / February 2026Location: Decathlon Belgium HQ, BrusselsDuration: 15 to 24 weeks (depending on school requirements)You’ll join a passionate, supportive, and data-driven team working at the intersection of sport, commerce, and tech.