Ruben Koster
OSS Contributor at Rabobank
Meppel, Drenthe, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolRuben Koster is an experienced DevOps and backend engineer with 13 years building and streamlining cloud-native CI/CD and deployment tooling, currently contributing to OSS at Rabobank. He has deep, practical involvement in Cloud Foundry and BOSH ecosystems—improving automation, CI pipelines, OAuth integrations, and secure certificate handling for projects like Concourse and bosh-cli. As a former Staff Engineer and Technical Lead at VMware and long-time Cloud Foundry consultant, he blends hands-on refactoring with operational efficiency and test-minded changes that reduce noise and increase reliability. Based in Meppel, Netherlands, Ruben pairs industrial-design training from TU Delft with pragmatic engineering, bringing a user-centered lens to infrastructure problems. Off the commit graph he’s a father of five and self-described “certified cat herder,” hinting at strong people and coordination skills beyond code.
12 years of coding experience
8 years of employment as a software developer
VWO Natuur en Techniek, VWO Natuur en Techniek at Vrije School GroningenBachelor's degree Industrial Design, Bachelor's degree Industrial Design at Delft University of Technology
English, Dutch
Github Skills (38)
bosh10
github-ci10
container10
docker10
cloud-foundry10
continuous-integration10
command-line-interface10
bash10
continuous-delivery10
dockers10
cicd10
ruby10
automation10
go10
command-line10
Programming languages (18)
Github contributions (5)
cloudfoundry/community
Sep 2021 - Jan 2023
Governance and contact information for Cloud Foundry
Role in this project:
DevOps Engineer
DevOps EngineerContributions:388 reviews, 110 commits, 95 PRs in 1 year 4 months
Contributions summary:Ruben focused on enhancing the Cloud Foundry community repository's automation and infrastructure. They refactored scripts for machine readability, integrated a GitHub projects sync for working groups, and updated the system to use ghproxy for org automation. Furthermore, the user made changes to reduce ghproxy logging noise, indicating a focus on operational efficiency. They also updated test suite configurations related to org management, indicating involvement in testing and ensuring the project's stability.
foundrycloud-foundrycloudfoundrypcfcontact-information
cloudfoundry/bosh-cli
Jan 2018 - Nov 2022
BOSH CLI v2+
Role in this project:Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:13 reviews, 15 commits, 22 PRs in 4 years 11 months
Contributions summary:Ruben contributed to the BOSH CLI project by implementing features and resolving issues related to release exporting. They added validation for job names during release export and refactored the code to not assume jobs are sorted. Additionally, the user modified the CLI to prefix exported release files with provided jobs, enhancing data organization. They also made several changes related to in-progress event updates and bumping bosh-utils for keepalive fixes.
boshcloud-foundrycloudfoundrypcfbosh-cli
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