Senior Data Scientist - Entity Linking & Graph ML

Sii Poland; Warszawa; On-site; PLN 190,000 - 270,000; Full time

Benefits offered by this job

Great Place to Work

Solid financial situation

Contracts with the biggest brands

Centre of internal trainings

Many experts you can learn from

Open and accessible management team

Profit sharing

Passion Sponsorship program

Regular integration events and trips

Comfortable and well-equipped offices

MySii app

Medical care

Job summary

Sii Poland is seeking a Senior Data Scientist to join a project building an AI-powered operating system for healthcare marketing. You will design and implement entity extraction, linking, and resolution at scale across large healthcare datasets to produce reliable entities and attributes.

You will own the linking pipeline end-to-end, apply graph ML techniques, embeddings, and GNNs, and collaborate with data engineers to ensure data quality and scalable ETL workflows in a production environment.

Qualifications

• Minimum 5 years of production ML or data-science experience with entity linking at scale.
• Strong Python production-grade, tested, and typed code.
• Experience with SQL and modern tooling (FastAPI, Docker, pytest, Git, CI/CD).
• Applied probabilistic methods for match scoring and evaluation.
• Familiarity with graph algorithms and graph ML (embeddings, GNNs).
• Experience with ETL and data-quality monitoring at scale.
• Experience with Snowflake, BigQuery, or Databricks and graph DBs like Neo4j or Neptune.
• Advanced English communication.

Responsibilities

• Extract entities from heterogeneous sources and reconcile attributes at scale.
• Design and implement probabilistic entity linking and deduplication.
• Own the end-to-end linking pipeline, including scoring and calibrated matches.
• Link to controlled medical vocabularies to ensure consistency.
• Apply graph representations and ML techniques for linking tasks.
• Build and maintain data and graph estates with ETL processes.
• Improve algorithms in response to changing data sources and volumes.

Skills

Entity linking

Python

SQL

FastAPI

Docker

pytest

Git

CI/CD

Probabilistic scoring

Graph ML

Embeddings

GNNs

ETL

Data quality monitoring

Snowflake

BigQuery

Databricks

Neo4j

Amazon Neptune

English (Advanced)

Education

Tools

FastAPI

Docker

pytest

Git

CI/CD

Snowflake

BigQuery

Databricks

Neo4j

Amazon Neptune

Job description

Sii Poland is seeking a Senior Data Scientist to join a project building an AI-powered operating system for healthcare marketing. You will design and implement entity extraction, linking, and resolution at scale across large healthcare datasets to produce reliable entities and attributes.

You will own the linking pipeline end-to-end, apply graph ML techniques, embeddings, and GNNs, and collaborate with data engineers to ensure data quality and scalable ETL workflows in a production environment.