Senior Data Scientist (f/m/x)

Expected, Graphs, Python, SQL, Git, Snowflake, BigQuery, Databricks

About the project, We are looking for a Senior Data Scientist to join a project focused on building an AI-powered operating system for healthcare marketing. In this role, you will design and implement entity extraction, linking, and resolution at scale, reconciling large and fragmented datasets into reliable entities and attributes. You will work on production-grade products that create real value in the life sciences industry, ensuring the integrity and quality of the data used for audience reach and insights.

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

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

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, Send your CV, Talk to us about your expectations, Learn more about our projects and choose the best, Start your adventure with Sii!

Sii Sp. z o.o., Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment., , Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.

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