Jeroen Janssens
Head Of Developer Relations
Rotterdam, South Holland, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolJeroen Janssens is Head of Developer Relations at Posit and a PhD-trained machine learning engineer with 12 years of experience building data visualization, ML, and data-pipeline solutions in Python, R, JavaScript, and Bash. He’s an experienced author—most recently of Python Polars: The Definitive Guide—and wrote the influential Data Science at the Command Line, blending practical tooling with reproducible workflows. Jeroen has led ML and data teams in industry and academia, shipping production pipelines with tools like DuckDB and Airflow and contributing robust utilities such as sql2csv to the popular csvkit project. As a DevRel leader and educator he connects open source communities, trainings, and product strategy, and he often automates complex builds and reproducible environments (e.g., Vagrant provisioning for book projects). Based in Rotterdam, he balances research pedigree with pragmatic engineering and a penchant for making powerful data tools accessible.
12 years of coding experience
13 years of employment as a software developer
Master of Science (cum laude), Artificial Intelligence, Master of Science (cum laude), Artificial Intelligence at Maastricht UniversityComputer Science, Computer Science at University of AdelaideDoctor of Philosophy - PhD, Machine Learning, Doctor of Philosophy - PhD, Machine Learning at Tilburg UniversityBachelor of Science (cum laude), Life Sciences, Bachelor of Science (cum laude), Life Sciences at University College Maastricht (UCM)
Stackoverflow
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Github Skills (21)
docker10
python10
testing10
linux10
bash10
dockers10
automation10
sqlalchemy10
sql10
csv10
automations10
vagrant10
devops10
command-line-interface9
cloud-infrastructure9
Programming languages (17)
Github contributions (5)
jeroenjanssens/data-science-at-the-command-line
Dec 2013 - Dec 2021
Data Science at the Command Line
Role in this project:
DevOps Engineer
DevOps EngineerContributions:1 release, 371 commits, 29 PRs in 8 years 1 month
Contributions summary:Jeroen's primary contributions involved setting up a Vagrant environment for the project, including the installation of necessary dependencies like Node.js, R, and the scientific Python stack. The commits show the creation of a build process for a Vagrant box, the integration of the Data Science Toolbox into a build, and various scripts to provision the environment, manage the data workflow, and ensure a clean environment. These changes were primarily focused on setting up and automating the build and deployment processes.
unixpythonshellclizsh
wireservice/csvkit
Mar 2014 - May 2014
Role in this project:Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:10 commits, 2 comments in 2 months
Contributions summary:Jeroen implemented the `sql2csv` utility, adding the core functionality for executing SQL queries against a database and outputting results in CSV format. They integrated the new utility into the project's setup.py and also developed unit tests for the `sql2csv` functionality, demonstrating a focus on ensuring code correctness. The user's contributions involved working with SQL, database connections, and CSV file manipulation.
csvcsv-readerfile-formatscsv-importconverting
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