Senior Data Scientist Reinforcement Learning – Offer intelligence (m/f/d) at SIXT

Lisbon, , Portugal -

Full Time

Start Date

Immediate

Expiry Date

20 Jan, 26

Salary

0.0

Posted On

22 Oct, 25

Experience

5 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

Bayesian Modeling, Regression Analysis, Statistical Methods, Feature Engineering, Data Validation, Model Deployment, Cloud Platforms, Containerization, Workflow Orchestration, A/B Testing, Causal Impact Methods, Stakeholder Management, Python Programming, MCMC Techniques, Data Analysis, Machine Learning

Industry

Travel Arrangements

Description

Company Description Job Description We work at the intersection of pricing science, advanced statistics, and scalable software. You’ll build and bring in production state-of-the-art probabilistic models - like hierarchical Bayesian regression, SVI, or bandit algorithms - that power millions of pricing decisions at SIXT every day. From shaping the analytical question to deploying live models, you’ll own the full lifecycle, supported by an innovation-friendly culture and great team. If you're excited by real-world impact, rigorous methods, and turning cutting-edge ideas into production - even if you don’t tick every box - we’d love to hear from you! YOUR ROLE AT SIXT You architect and prototype advanced regression models (linear, GLM, mixed-effects, Gaussian Process) with a principled Bayesian approach, guiding pricing strategy at scale You apply techniques like SVI, MCMC, and importance sampling to enable robust decision-making under uncertainty, even with sparse, high-volume, or streaming data You build and maintain reproducible pipelines for feature engineering, label generation, and automated data validation using tools like Airflow or Dagster, ensuring high code quality and reliability You deploy models via FastAPI, Docker, or Kubeflow, and establish real-time monitoring with Bayesian control charts and performance dashboards to catch drift and anomalies early You design sophisticated A/B and multivariate tests, apply quasi-experimental and causal impact methods, and quantify the value of information to balance exploration and exploitation You collaborate with product and revenue leaders to translate ambiguous ideas into testable hypotheses, while mentoring peers and elevating Bayesian practice through internal publications and workshops YOUR SKILLS MATTER Expertise You bring deep statistical chops, with 5+ years of applying regression, hierarchical models, or state-space methods in production Computing proficiency You have a well-stocked Bayesian toolbelt - fluent in PyMC, Stan, NumPyro, TFP, or similar - and are comfortable writing custom likelihoods and priors. Modeling You have proven experience scaling inference using SVI, black-box VI, or advanced MCMC techniques on large datasets Engineering practices You write solid, production-grade Python code and are familiar with type hints, testing frameworks, and CI/CD workflows Infrastructure You are hands-on with cloud platforms like AWS, GCP, or Azure, and have experience with containerization (Docker/K8s) and workflow orchestration Stakeholder management You communicate uncertainty, lift, and risk in plain English for executives, while engaging deeply with scientists and engineers 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, external conferences, and internal dev & tech talks 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!

Responsibilities

You will architect and prototype advanced regression models to guide pricing strategy at scale and apply techniques for robust decision-making under uncertainty. Additionally, you will build and maintain reproducible pipelines and deploy models while collaborating with product and revenue leaders.