Klaas Van Schelven
Founder at Bugsink
Utrecht, Utrecht, Netherlands
Summary
👤
Senior🎓
Top SchoolKlaas Van Schelven is a pragmatic founder and senior Python/Django engineer with 19 years of experience building and hardening production systems, currently leading Bugsink, a self-hosted error-tracking product born from a privacy-first mindset. His background ranges from co-founding and scaling SaaS at Legalsense to delivering critical Python models at Rabobank and public-sector systems for Politie Nederland, with deep hands-on expertise in CI/CD, refactoring legacy code, and reusable library design. An active open-source contributor, Klaas has improved core tooling and frameworks — from pip documentation to Django bug fixes and Cloud Foundry’s Python buildpack — showing an eye for developer experience and build-time reliability. He also explores program construction theory in academic work (published at the European Lisp Symposium), revealing a thoughtful, research-minded approach to tooling and language design. Based in Utrecht, he combines startup grit with enterprise discipline and a clear emphasis on observability and secure, private infrastructure.
18 years of coding experience
21 years of employment as a software developer
MSc Computer Science, MSc Computer Science at Utrecht UniversityStedelijk Gymnasium, Leiden
Stackoverflow
2,496reputation
850kreached
51answers
35questions
forms
top-5%
Github Skills (30)
cloud-foundry10
python10
django10
packaging10
go10
orm10
pip10
documentation10
buildpack10
application-framework9
migration9
cicd9
forms9
app-framework9
web-framework9
Programming languages (16)
Github contributions (5)
pypa/pip
Feb 2021 - Jul 2022
The Python package installer
Role in this project:
Technical Writer
Technical WriterContributions:3 reviews, 11 commits, 2 PRs in 1 year 5 months
Contributions summary:Klaas primarily focused on improving the documentation of the `pip` package installer. Their contributions included adding warnings about security vulnerabilities related to dependency confusion when using `--extra-index-url` and clarifying the behavior of `pip cache`. They also added links to relevant resources and corrected formatting issues within the documentation. Furthermore, the user updated the output of `pip cache` to be more explicit.
pythonpackage-installerpippackaginginstaller
cloudfoundry/python-buildpack
Jun 2022 - Dec 2022
Cloud Foundry buildpack for the Python Language
Role in this project:DevOps Engineer
DevOps EngineerContributions:2 reviews, 10 commits, 6 PRs in 6 months
Contributions summary:Klaas primarily contributed to improving the Python buildpack's functionality and maintainability. They added debug logging for Django's `collectstatic` process to aid in troubleshooting. They also made significant changes to the build process including fixing test, updating pip installation. The user worked with the requirements to improve pip's usage during build.
foundrypythoncloud-foundryv2bbuildpack
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