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SIXTSI

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

Sixt SE is an international mobility service provider offering vehicle rental, car sharing, ride-hailing, and car subscriptions across over 100 countries. Founded in 1912, the company is headquartered in Pullach, Germany, and is co-led by CEOs Alexander Sixt and Konstantin Sixt.

SIXT

Employee count: 5000+

Portugal only

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

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!

About the job

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Posted on

Job type

Full Time

Experience level

Senior

Location requirements

Hiring timezones

Portugal +/- 0 hours

About SIXT

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Sixt SE is an international mobility service provider with a rich history dating back to its founding in 1912 by Martin Sixt in Munich, Germany. Initially established with a modest fleet of three cars, it was the first car rental company in Bavaria. Over the decades, Sixt has evolved from a local car rental business into a global leader in premium mobility services. The company operates in over 100 countries with approximately 2,000 locations worldwide. Sixt SE functions as the parent and holding company of the Sixt Group, which is active in various business areas including vehicle rental (SIXT rent), car sharing (SIXT share), ride-hailing (SIXT ride), and car subscriptions (SIXT+). These services are integrated into a single mobility platform called ONE, accessible via the SIXT App.

The company has consistently demonstrated a commitment to customer orientation, innovation, and strong technological competence. Sixt was a pioneer in the industry, being the first car rental company with a website and the first to accept mobile reservations. A significant portion of Sixt's fleet consists of premium vehicles, and the company is known for its attractive price-performance ratio. The majority of the company remains owned by the Sixt family, who continue to manage its operations. In June 2021, Alexander Sixt and Konstantin Sixt were appointed as co-CEOs, succeeding their father Erich Sixt, who transitioned to Chairman of the Supervisory Board after more than 50 years at the helm. Sixt serves a diverse clientele, including private individuals, tourists, and corporate clients across various industries. The company has a significant presence in key markets such as the US, the UK, Germany, France, Spain, Italy, Austria, Switzerland, Belgium, and the Netherlands. Sixt continues to expand its global footprint, including recent growth in North America and Australia.

Employee benefits

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401k plan

Retirement savings plan.

Wellness Plan

Wellness initiatives for employees.

Discount on Selected Cars at Fleet Discount

Employee discounts on car purchases.

Healthcare programs

Company-sponsored healthcare programs.

View SIXT's employee benefits
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SIXT

Company size

5000+ employees

Founded in

1912

Chief executive officer

Alexander Sixt, Konstantin Sixt

Employees live in

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SIXT hiring Senior Data Scientist Reinforcement Learning – Offer intelligence (m/f/d) • Remote (Work from Home) | Himalayas