Senior Data Scientist (f/m/x)

Sii Sp. z o.o. is seeking a Senior Data Scientist to join a project focused on building an AI-powered operating system for healthcare marketing. You will be responsible for designing and implementing entity extraction, linking, and resolution at scale, ensuring the integrity and quality of data used for audience reach and insights within the life sciences industry.

Key responsibilities

• Extracting entities and attributes from heterogeneous sources including warehouse tables, registries, and documents.
• Designing and implementing probabilistic entity linking and deduplication across multiple large healthcare datasets.
• Owning the linking pipeline from end to end, including pairwise and graph-based scoring and calibrated match probabilities.
• Defining how link quality is measured through precision, recall, calibration, and error analysis.
• Utilizing graph representations and graph ML techniques for linking, including clustering, centrality, and link prediction.

Requirements

• Minimum 5 years of experience in shipping production ML or data-science work, including hands-on entity linking and resolution at scale.
• Deep expertise in Python, including production-grade, tested, and type-hinted code.
• Strong command of SQL and experience with FastAPI, Docker, pytest, Git, and CI/CD practices.
• Practical experience in probabilistic methods for match scoring, threshold selection, and evaluation.
• Familiarity with distributed SQL warehouses such as Snowflake, BigQuery, or Databricks.

What we offer

• Employment stability within a leading technology consulting company.
• Access to a profit-sharing program and an attractive benefits package including private healthcare.
• Extensive investment in professional growth through training platforms, webinars, and meetups.
• Opportunity to work on fascinating projects for prestigious global brands.