Data Scientist - OR (Revenue Management & Fleet Optimization) (m/f/d)

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About the role

Join our team of data science and machine learning experts to shape next-generation fleet strategies. We answer one of the most impactful questions in our business: how many cars of each type should be in each location, at any point in time? Our long-term fleet planning decisions directly drive revenue management, purchasing, and pricing across the business — and ensure we have the right cars in the right places to deliver the best experience for every customer. We're looking for a Senior Data Scientist – Operations Research with a strong background in mathematical optimization and machine learning — someone with both a solid theoretical foundation and a proven track record of applying these methods in practice. Ideally, you also bring revenue management expertise, for example hands-on experience in dynamic pricing or stock planning optimization. YOUR ROLE AT SIXT • You design, develop, and deploy advanced fleet planning systems that support all parts of the business, from purchasing decisions to pricing to financial projections • You formulate and solve complex optimization problems, including linear, nonlinear, dynamic, and stochastic, to maximize margin and support key decision making processes • You plan decisions that affect stakeholders across the business, and explaining the why behind the results is just as important as the results themselves • You build models that capture the real world complexity of renting cars, from how pricing decisions are made to how cars are allocated to customers • You stay current on the latest research in revenue management, operations research, and machine learning, and bring new ideas into the team • You provide mentorship and guidance to junior team members YOUR SKILLS MATTER • Optimization & Solvers You bring a strong background in mathematical optimization, including linear, nonlinear, and integer programming, solvers, and algorithm design such as dynamic and stochastic programming • Education You hold a Master's degree or higher in Operations Research, Applied Mathematics, Statistics, or a related quantitative field • Machine Learning You have a solid understanding of supervised and unsupervised ML techniques, model evaluation, and how to take a model from experimentation to a reliable, maintainable production system • Programming Skills You bring expertise in Python for data analysis, modeling, and production deployment • AI Proficiency You use AI tools to accelerate development and analysis, stay up to date with the latest developments, and actively drive adoption across the team • Analytical Mindset You translate complex problems into actionable models and analyses, and communicate findings clearly to different audiences • Revenue Management Expertise (Plus) You have experience implementing or optimizing revenue management or stock optimization systems WHAT WE OFFER • The SIXT Lisbon Experience Two of Lisbon's most exciting hubs — Factory Lisboa in Beato and ARTs Lisboa in Parque das Nações — are where you'll find your new home base. Expect a fast-paced, international atmosphere where ideas flow freely, people genuinely look out for each other, and no two days feel quite the same • Community & International Environment Join a truly global workplace with colleagues from many nationalities. Regular team events, community activities, and inspiring talks with internal and external speakers make our Lisbon hubs more than just an office • Flexibility & Modern Work Setup Benefit from a hybrid working model with two office days per week and flexible working hours. Our modern offices are designed for collaboration while allowing you the flexibility to work in the way that suits you best • AI at your fingertips From day one, you'll have access to Claude by Anthropic and SIXTgp

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