Senior Data Scientist - Tech Lead (m/f/d)

Company Description

Job Description

As a Senior Data Scientist  – Tech Lead, you will take ownership of end-to-end delivery for complex, data-driven projects that combine multiple machine learning models and software components. You’ll lead technical design, architecture, and implementation for a key project within our Data Science organization, ensuring that our solutions deliver measurable business impact and technical excellence. You will act as the technical anchor for a small team (2–5 members), coordinating design, delivery, and quality across all project components, while mentoring junior data scientists and collaborating closely with product managers, engineers, and business stakeholders. This is a technical leadership role within a single complex project scope — focused on delivery excellence, technical decision-making, and fostering a high-performing team culture.

YOUR ROLE AT SIXT

• You lead end-to-end delivery of data science projects, ensuring timely execution, technical quality, and alignment with business goals.
• You translate complex business challenges into scalable ML solutions, balancing experimentation with long-term maintainability.
• You own the technical architecture, designing robust, integrated systems in collaboration with platform and product teams.
• You mentor and grow your team, fostering a collaborative, learning-driven culture and supporting career development.
• You champion engineering excellence, driving best practices in coding, testing, CI/CD, and observability across ML pipelines.
• You influence product strategy through clear communication of technical trade-offs, risks, and data-driven insights to stakeholders.

YOUR SKILLS MATTER

• Applied Machine Learning Expertise You bring 5+ years of experience in Data Science or Machine Learning, with a strong track record of delivering production-grade ML solutions across diverse domains.

• Technical Leadership You have 1+ years of experience in a technical leadership role, guiding teams through end-to-end ML project lifecycles—from problem framing to deployment.

• Modeling Mastery Proven ability to lead end-to-end machine learning projects from design to production.

• Engineering Excellence Strong proficiency in Python and common ML frameworks (e.g., PyTorch, TensorFlow, scikit-learn). Experience designing and evaluating ML models using diverse metrics and validation strategies. Strong understanding of data pipelines, APIs, and productionization of ML systems.

• Mentorship & Best Practices You’ve mentored junior team members and championed engineering best practices, fostering a culture of learning and technical excellence.

• Communication & Collaboration You excel at translating complex technical concepts into clear business insights, and thrive in cross-functional environments with diverse stakeholders.

• Preferred Qualifications Experience in cloud environments (AWS, GCP, Azure) and modern MLOps practices. Exposure to large-scale data systems, streaming data, or multi-model architectures.

WHAT WE OFFER

• Generous Time Off Enjoy 28 days of vacation, an additional day off for your birthday, and 1 volunteer day per year
• Work-Life Balance & Flexibility Benefit from a hybrid working model, flexible working hours, and no dress code
• Great Employee Benefits Access discounts on SIXT rent, share, ride, and SIXT+, along with partner discounts
• Training & Development Participate in training programs designed for your personal growth and development
• Health & Well-being Private health insurance to support your well-being
• Additional Perks Enjoy the Coverflex advantage system to enhance your employee experience

Additional Information

About us:

We are a globally leading mobility service provider with a revenue of €4.00 billion and around 9,000 employees worldwide. Our mobility platform ONE combines our products SIXT rent (car rental), SIXT share (car sharing), SIXT ride (taxi, ride, and chauffeur services), and SIXT+ (car subscription), giving our customers access to our fleet of 350,000 vehicles, the services of 4,000 cooperation partners, and around 5 million drivers worldwide. Together with our franchise partners, we are present in more than 110 countries at 2,000 rental stations. At SIXT, top-tier customer experience and outstanding customer service are our highest priorities. We believe in true entrepreneurship and long-term stability and align our corporate strategy with foresight. Get started with us and apply now!