Sijmen
Software Engineer
Delft, South Holland, Netherlands
Summary
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RockstarSijmen is a software engineer based in Delft, Netherlands, with 11 years of practical experience modernizing developer workflows and CI/CD pipelines. He brings hands-on expertise in DevOps practices, demonstrated by replacing legacy CI with GitHub Actions and streamlining testing, coverage, and documentation for a popular Python scheduling library. Known as a "Happy Developer" on GitHub, he focuses on pragmatic improvements that reduce maintenance burden—such as cleaning tox configurations and managing Python version support. Comfortable across both development and ops, he excels at making open-source projects more robust and contributor-friendly while keeping day-to-day engineering sustainable.
11 years of coding experience
Stackoverflow
497reputation
25kreached
16answers
1question
Github Skills (17)
github-ci10
cicd10
githubaction-workflow10
python9
testing8
multipart-formdata6
open-closed-principle6
docker6
typescript6
java6
docker-compose6
javascript6
form-data6
factory6
dockers5
Programming languages (17)
Github contributions (5)
dbader/schedule
Nov 2020 - Apr 2022
Python job scheduling for humans.
Role in this project:
DevOps Engineer
DevOps EngineerContributions:52 reviews, 29 commits, 110 PRs in 1 year 5 months
Contributions summary:Sijmen's primary contribution focused on modernizing the project's build and testing infrastructure. This involved replacing Travis CI with GitHub Actions, streamlining coverage and documentation processes, and updating badges. They also addressed Python version support and cleaned up the `tox.ini` configuration. The user's work had a direct impact on the project's CI/CD pipeline and testing procedures.
pythonschedulingfor-humansjobjob-scheduling
SijmenHuizenga/DUT20d-Car-Management-System
Nov 2019 - Sep 2020
Contributions:99 commits in 9 months
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