Stijn De Gooijer
Machine Learning Engineer II at Booking.com
Amsterdam, North Holland, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolStijn De Gooijer is a Machine Learning Engineer II based in Amsterdam with 11 years of experience building production ML systems, data platforms, and cloud pipelines. He blends deep data-science expertise and Python engineering with systems-level work in Rust, contributing backend refactors to the popular Polars dataframe project. At companies from Albert Heijn to Booking.com he has focused on driving automation, stability, and performance for services used by millions, while also designing SDKs and managing database migrations. A hands-on leader and mentor, he moves smoothly between strategic technical direction and detailed implementation. Unusually for an ML engineer, he pairs a Master's in AI with a formal background in dance education, reflecting an uncommon mix of analytical rigor and creative discipline.
11 years of coding experience
10 years of employment as a software developer
Master's Degree, Artificial Intelligence, 8.1/10, Master's Degree, Artificial Intelligence, 8.1/10 at University of AmsterdamBachelor of Education, Dance Teacher, Bachelor of Education, Dance Teacher at Amsterdam University of the Arts
Dutch, English, German, French
Stackoverflow
428reputation
5kreached
8answers
4questions
Github Skills (14)
rust10
expression10
parsing10
parse10
expressions10
data-structure9
data-structures9
json6
git6
mypy6
pandas6
python-polars6
python6
dataframe6
Programming languages (13)
Github contributions (5)
pola-rs/polars
Jun 2021 - Jan 2023
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
Role in this project:
Back-end Developer
Back-end DeveloperContributions:3 releases, 1890 reviews, 226 commits in 1 year 7 months
Contributions summary:Stijn primarily contributed to the backend of the polars-rs/polars repository, focusing on refactoring and enhancements to the expression system. Their work involved renaming functions, deprecating methods, and improving the deserialization and serialization process for various data types within the expression framework. The user also made changes related to column and index selection, ensuring the code's robustness and maintainability.
polarsdataframespythondataframerust
pola-rs/polars-cli
Aug 2023 - Jan 2025
CLI interface for running SQL queries with Polars as backend
Contributions:14 reviews, 72 PRs, 61 pushes in 1 year 5 months
polarssql
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.