Senior/Lead Data Scientist (Type B)

If you want to:

• Enhance and maintain our experimentation platform that uses a layered architecture with BigQuery (DWH) and DuckDB (OLAP);
• Implement and validate statistical methods for A/B testing analysis
• Design and maintain statistical engines for hypothesis testing, power analysis, and experiment sizing;
• Develop new statistical features while ensuring mathematical correctness;
• Support Experimentation team with technical implementation of their test designs;
• Optimize data pipelines and ETL processes for handling experimental data;
• Improve platform scalability and performance while maintaining data integrity;
• Work closely with DevOps team on deployment and infrastructure requirements.

And you can check off:

• Relevant BSc or MSc and at least 5 years of industry experience;
• Ability to balance statistical rigor with practical implementation;
• Strong track record of building and maintaining data platforms;
• High proficiency in Python;
• Solid Unix/Linux environment experience;
• Experience with A/B testing platforms or experimentation frameworks would be considered as an advantage;
• Experience with various data bases, particularly DuckDB would be considered as an advantage;
• Experience with building Python based front-end applications, particularly Streamlit would be considered as an advantage;
• Strong communication skills to work with both technical and non-technical stakeholders;
• Self-motivated with ability to work independently;
• Ability to translate business requirements into technical solutions.

Here’s the deal:

• Growth and learning opportunities: time dedicated to learning, conferences, online learning platforms, and books for your professional development;
• Health and wellness: we want you to feel and be your best. That's why we offer various benefits, from online workouts with a physical coach and sports card to health insurance and regular mental health checks;
• Tools of your choice: choose the technical equipment and tools you need to do your best work;
• Community and celebrations: get ready for long-lasting traditions such as yearly workation, Friday get-togethers, various team buildings and company celebrations;
• Convenient commuting: traveling from point A to point B in a city like Warsaw is quite a journey! That’s why we compensate your public transport costs;
• Work-life balance: as a general rule, we work based on a 3+2 hybrid model. And let’s not forget the WFA policy – an opportunity to work from anywhere in the world;
• Premium Surfshark accounts: for you, your family, and friends!