Senior Data Scientist

• Drive the evolution of our recommendation landscape and shape how people discover employers, jobs and content on kununu.
• Own the full data science process: from framing the problem and exploring the data to modelling, evaluation and production rollout.
• Apply methods such as bandits and reinforcement learning to personalize content in a live, high-traffic environment.
• Design and build LLM-driven, agentic applications on top of a large body of unstructured data, and set up solid evaluation for them, including LLM-as-a-judge approaches.
• Work closely with product and engineering to turn business questions into data science problems and bring your models into the product.
• Define with product what success looks like: choose the right metrics and evaluation strategy, run experiments, and turn hypotheses into empirical results within weeks.
• ML-Lifecycle: Work with transformation tooling to build reproducible data foundations for your models, monitor quality and cost, and improve them over time.
• Mentor more junior colleagues in the team: review their work, share your knowledge and help them grow.
• Act as a sparring partner for the team lead on statistical methods, machine learning concepts and solution design.

• Several years of hands-on data science experience, including at least one recommendation or personalization system you brought to production.
• A strong foundation in statistics and machine learning. Practical experience with multi-armed bandit experimentation or reinforcement learning is a big plus.
• You are comfortable across classical machine learning problems such as classification, ranking and scoring, not only recommendations.
• Real production experience with LLM-based applications: agentic tools, LLM judges and evaluation harnesses.
• Solid Python and SQL skills. You are comfortable in a modern data warehouse and with transformation tools such as dbt.
• You write clean, tested and reusable code, and you see version control and code reviews as a normal part of your work.
• You explain complex results in simple terms to people outside data science, and you enjoy mentoring and giving constructive feedback.

The gross annual salary for this position ranges between €60,000 and €82,000 depending on qualifications and experience., * 6 week vacation

• Mobile devices also for private use
• Drinks, food & goodies
• Restaurant vouchers and employee discount
• Up to 12 weeks Workation
• Remote work option
• Trust-based working hours
• Communication on equal terms

We’re looking for an experienced Senior Data Scientist to join our Data Science team. You’ll drive the re-imagining of our recommendation landscape: a project that will change how millions of people experience kununu. You’ll work on a platform with a lot of traffic, so you can go from an idea to real results within weeks. On top of that you’ll build agentic, LLM-driven applications on one of the largest collections of workplace insights in the German-speaking world, with a fast-growing stream of fresh feedback data. If you like to test hypotheses quickly and see how your models perform under real product constraints, this is the place for you.