Jeroen Janssens
Jeroen Janssens, PhD, is Head of Developer Relations at Posit, PBC. His expertise lies in visualizing data, implementing machine learning models, and building solutions using Python, R, JavaScript, and Bash. He’s passionate about open source and sharing knowledge. He’s the author of Python Polars: The Definitive Guide (O’Reilly, 2025) and Data Science at the Command Line (O’Reilly, 2021). Jeroen holds a PhD in machine learning from Tilburg University and an MSc in artificial intelligence from Maastricht University. He lives with his wife and two kids in Rotterdam, the Netherlands.
Session
Being able to write Python scripts is an incredibly useful skill, allowing you to automate nearly any task imaginable. However, with a bit of extra effort, those brittle scripts can be transformed into robust, reusable tools. In particular, tools that you can run from the command line or that can be run by coding agents. Future-you will thank you for making the extra effort.