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Sii Sp. z o.o.

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

Sii Sp. z o.o. Show all offers
B2B
Hybrid
Senior
Wrocław
Łódź
Warszawa
Bydgoszcz
+10
Expires Nov 11, 2026
22 days ago

In short

Senior Data Scientist role focusing on AdTech & Healthcare. Responsibilities include model performance improvement, designing new ML methodologies, entity linking, and graph technologies. Requires 5+ years of ML experience, Python data-science libraries, SQL, and English.

Keywords

machine learning data engineering python sql entity linking graph technologies pytorch snowflake bigquery

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Technologies we use

About the project

Your responsibilities

  • 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

Our requirements

  • 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

Optional

  • 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
Published 2026-10-12
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