Senior Data Scientist Reinforcement Learning – Offer Intelligence (mfd)

We work at the intersection of pricing science offer personalisation advanced statistics and scalable software. Youll build and bring into production state-of-the-art probabilistic models - like hierarchical Bayesian regression SVI or bandit algorithms - that power millions of pricing and offer decisions at SIXT every day. Beyond pricing were building the intelligence layer that decides which offer and which experience each customer sees so your models shape both what we charge and what we show. From shaping the analytical question to deploying live models youll own the full lifecycle supported by an innovation-friendly culture and great team. If youre excited by real-world impact rigorous methods and turning cutting-edge ideas into production - even if you dont tick every box - wed 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 design and productionise personalisation and recommendation systems - two-tower retrieval embedding-based candidate generation learning-to-rank sequential/transformer models - with contextual bandits and off-policy evaluation to keep them learning from real interactions

• 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 revenue and customer experience 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

• Personalisation (nice to have) You have experience with recommender and personalisation stacks - two-tower / embedding retrieval learning-to-rank sequential models contextual bandits - plus counterfactual or off-policy evaluation to prove incremental value rather than optimise click-through

• 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

• A Global Tech Hub in Lisbon Join a thriving international tech community and work alongside engineers product experts and business teams who turn ideas into real impact. Our hubs at Factory Lisboa in Beato and ARTs Lisboa in Parque das Nações are where great tech gets built

• Learning & Knowledge Exchange Level up through regular events with internal and external speakers. We value curiosity continuous learning and open exchange across teams disciplines and borders

• Flexible Work Setup Two office days a week flexible hours and modern spaces built for both deep focus and team collaboration work the way that brings out your best

• Time Off & Wellbeing Enjoy 28 vacation days per year an additional day off on your birthday one volunteer day annually and private health insurance that also covers your spouse and children free of charge

• Practical Everyday Benefits Get a yearly Coverflex allowance and a daily meal allowance to make everyday life a little easier

• SIXT Perks Get exclusive rates on all SIXT services with special discounts extended to your family and friends. Because great perks are even better when you can share them

Additional Information :

About us:

We are a globally leading mobility service provider with a revenue of 4.00 billion and around 9000 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 350000 vehicles the services of 4000 cooperation partners and around 5 million drivers worldwide. Together with our franchise partners we are present in more than 110 countries at 2000 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!

Remote Work :

No

Employment Type :

Full-time

Experience: years
Vacancy: 1