Sii PolskaActive opening

Senior Data Scientist – AdTech & Healthcare (f/m/x)

Toruń, PolandOn-siteSeniorFound today
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Tired of building yet another chatbot POC? Do you want to train ML models that bring real monetary value and run at a billion-scale? Do you feel like introducing a brand-new probabilistic methodology for a real-world problem?

We build the AI-powered operating system for healthcare marketing - programmatic advertising, data intelligence, patient affordability and AI-enabled engagement for the life sciences industry.

We are looking for a person who knows how to design and implement statistical methods to extract signals from large, messy, real-world datasets and use them for prediction. Everything we build on top of that, from audience reach to specialty insight to measurement, is only as good as your layer.

  • Measuring existing model performance and finding ways to improve it

  • Owning the design of the new methodology and training the next-gen model for increased predictive power, sample efficiency, and scalability to large datasets

  • Extracting unique entities and sparse attributes from heterogeneous sources – both structured and unstructured

  • Designing and implementing probabilistic entity linking & matching across multiple large healthcare datasets

  • Exploring graph technologies and graph theory

  • Building and owning an analytics data store, evaluation, and monitoring pipelines

  • Minimum 5 years of experience in training and monitoring ML models for production use

  • Experience with data and ML engineering, including ML-facing ETL processes over very large datasets and data-quality monitoring

  • Expertise in Python data-science and ML libraries like scikit-learn, PyTorch, LightGBM, Splink, spaCy, and Hugging Face

  • Practical experience in probabilistic methods for entity linking, matching, imputation, scoring, and evaluation

  • Strong command of SQL for distributed warehouses such as Snowflake, BigQuery, or Databricks

  • Advanced level of English

Nice-to-have requirements

  • Experience with graph technologies such as Neo4j, Amazon Neptune, Stardog, or similar platforms
  • Familiarity with Graph Machine Learning concepts, including community detection, Graph Neural Networks (GNNs), and graph embeddings
  • Exposure to AI-powered development tools such as Cursor AI, Claude Code, or equivalent solutions
  • A proactive mindset with a willingness to take ownership of deliverables and contribute to product direction

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Sii PolskaSenior Data Scientist – AdTech & Healthcare (f/m/x)
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