Senior Data Scientist

Xebia sp. z o.o. is the employer offering the position. The work location is in Warszawa, Żelazna street.

• Extensive hands-on experience in designing, training, and improving Deep Learning models for production use cases.
• Proven expertise with deep learning frameworks such as PyTorch or TensorFlow, and strong practical knowledge of Pandas and NumPy.
• Advanced SQL skills, preferably including analytical SQL for large-scale data environments.
• Strong experience with public cloud infrastructure, preferably Google Cloud Platform, including ML services like Vertex AI and Vertex Pipelines.
• Proven ability to lead end-to-end model development from problem framing to production handoff.
• Strong engineering foundations including writing production-level, testable, and documented Python code and familiarity with CI/CD practices.
• Ability to mentor other Data Scientists and improve modeling standards.
• Relevant academic degree or extensive professional experience in STEM fields such as Computer Science, Mathematics, or Physics.
• Openness to on-site workshops (1-3 per quarter) in Warsaw.

Nice to have:

• Experience developing ML models for low-latency online applications.
• Experience in advertising or marketing domains.
• Experience in developing ML models for business event predictions like CTR and CVR.
• Proficiency in traditional machine learning techniques such as Gradient Boosted Trees.
• Experience in mentoring, technical leadership, or coordinating model development across teams.
• Practical use of AI-assisted coding tools to improve engineering productivity and quality.

• Drive the design, refinement, and evaluation of ML scoring models (e.g., CTR, CVR, and RoAS).
• Design architecture of model strategies for complex solutions integrating user, product, and placement signals.
• Ensure readiness of models for high-throughput and low-latency environments.
• Collaborate with engineering and business stakeholders to translate strategic goals into measurable modeling outcomes and technical roadmaps.
• Provide technical leadership and quality assurance for Data Science workstreams to ensure alignment with production standards.

The administrator of Personal Data for recruitment is Xebia Sp. z o.o. located in Wrocław, registered under KRS 0000978067. Personal Data collection follows GDPR principles with minimal processing. Additional Personal Data provision is voluntary. Withdrawal of consent is possible at any time by contacting Xebia via registered address or email. Full Privacy Policy is available online.