Senior Data Scientist (f/m/x)

Our 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
• Comfort with graph algorithms and graph ML techniques, including embeddings and GNNs
• Experience with data and ML engineering, including ETL processes over large datasets and data-quality monitoring
• Familiarity with distributed SQL warehouses such as Snowflake, BigQuery, or Databricks, and graph technologies like Neo4j or Amazon Neptune
• Advanced level of English

Your 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
• Linking entities and attributes to controlled medical vocabularies to ensure consistency across sources
• Utilizing graph representations and graph ML techniques for linking, including clustering, centrality, and link prediction
• Building and maintaining the data and graph estate, including warehouse transformation and monitoring
• Continuously improving the performance of existing algorithms in response to changing data sources and volumes

About the project

What we offer

• Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas
• Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market
• We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022
• Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more
• Comfortable workplace – class A offices or remote work
• Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application
• PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers
• Investment in your growth – meetups, webinars, training platform and technology blog – you choose
• Fantastic atmosphere created by all Sii Power People

Recruitment stages

• 1.
  Send your CV
• 2.
  Talk to us about your expectations
• 3.
  Learn more about our projects and choose the best
• 4.
  Start your adventure with Sii!

Sii Sp. z o.o.