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

Sii is seeking a Senior Data Scientist to join our team building an AI-powered operating system for healthcare marketing. You will work on high-scale programmatic advertising and data intelligence solutions, designing and implementing advanced statistical methods to extract signals from complex, real-world datasets.

Key responsibilities

• Measuring existing model performance and identifying opportunities for improvement.
• Designing new methodologies and training next-generation models to enhance predictive power and scalability.
• Extracting unique entities and sparse attributes from diverse structured and unstructured data sources.
• Developing probabilistic entity linking and matching processes across large-scale healthcare datasets.
• Building and maintaining analytics data stores, evaluation frameworks, and monitoring pipelines.

Requirements

• Minimum 5 years of professional experience in training and monitoring machine learning models for production environments.
• Strong expertise in Python data science libraries such as PyTorch, scikit-learn, LightGBM, and spaCy.
• Proven experience with ML-facing ETL processes and data quality monitoring for large datasets.
• Advanced proficiency in SQL for distributed data warehouses like Snowflake, BigQuery, or Databricks.
• Practical knowledge of probabilistic methods for entity matching, imputation, and scoring.

What we offer

• Opportunity to work on high-impact AI models that operate at a billion-scale.
• A fully remote work environment with a focus on professional growth and technical ownership.
• Engagement in cutting-edge projects involving graph technologies and advanced predictive analytics.