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Leon W

@leonw

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Data Scientist at Schwarz Digits building Spark SQL attribution pipelines on terabytes of cross-channel data.

Germany

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What I'm looking for

I'm looking for fully remote B2B or daily-rate contracts in the CET time zone, available from December 2026.

At Schwarz Digits, I built scalable Spark SQL pipelines for marketing attribution on terabytes of cross-channel data, cutting runtime from six hours to one. I also applied transformer architectures and language modeling to large-scale data problems.

At Lidl Data & AI, I developed a forecasting solution used across 30+ countries that cut purchasing time per item from about eight minutes to about two. Earlier, at PIKON Analytics, I designed and implemented named entity recognition models to improve master data cleansing.

Experience

Work history, roles, and key accomplishments

Current

Data Scientist

Current

Schwarz Digits

Aug 2025 - Present (1 year 3 months)

Built scalable Spark SQL pipelines for marketing attribution on terabytes of cross-channel data, cutting runtime from 6 hours to 1 hour. Improved marketing measurement with robust attribution models and applied transformer architectures to large-scale data problems.

Spark SQL Databricks Python JavaScript Snowflake GCP Marketing Attribution Transformers Language Modeling

Data Scientist

Lidl Data & AI

Sep 2021 - Aug 2025 (3 years 11 months)

Developed and rolled out a forecasting solution used across 30+ countries, cutting purchasing time per item from ~8 to ~2 minutes. Coordinated cross-functional projects for data integration and analysis, and built applications end to end.

Python SQL Spark Databricks Snowflake Azure Forecasting Data Integration Application Development

Junior Data Scientist

PIKON Analytics

Sep 2020 - Sep 2021 (1 year)

Designed and implemented named entity recognition (NER) models and used NLP to improve data quality in master data cleansing. Ran internal workshops on AI tools and technologies for the data team.

Python NLP SpaCy Hugging Face Named Entity Recognition Data Cleaning

Education

Degrees, certifications, and relevant coursework

Maastricht University

Master of Science, Data Science & Smart Services

2019 - 2020

Grade: Cum Laude

M.Sc. in Data Science & Smart Services, graduated Cum Laude. Thesis applied deep learning NLP techniques to electronic health records to detect adverse events in heart failure patients.