Jappie Klooster
Technical Lead at Converge
Kampen, Overijssel, Netherlands
Summary
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Senior🎓
Top SchoolJappie Klooster is a Technical Lead with 12 years of software engineering experience, based in Kampen, Netherlands, who specializes in Haskell, reproducible deployments (nix), and reliability engineering. He has led greenfield projects and productionized AI-driven products, moving quickly from consultant to technical lead at Converge while shaping team skills and priorities. His open-source contributions include improving error handling and test coverage in the well-known Yesod Haskell web framework, reflecting a pragmatic focus on robustness under failure. Comfortable across backend systems, distributed job queues, and deployment tooling, he combines hands-on coding with mentorship and operational discipline. Colleagues rely on him as a steady technical beacon who prefers practical, well-tested solutions over bells and whistles.
13 years of coding experience
11 years of employment as a software developer
Master of Science - MS Artificial Intelligence, Master of Science - MS Artificial Intelligence at Utrecht UniversityBachelor's degree Computer Software Engineering, Bachelor's degree Computer Software Engineering at Windesheim
Dutch, English, chinees, German, fries
Github Skills (5)
yesod10
error-handling10
haskell10
testing10
cicd5
Programming languages (25)
Github contributions (5)
yesodweb/yesod
Mar 2022 - Aug 2022
A RESTful Haskell web framework built on WAI.
Role in this project:
Back-end Developer & QA Engineer
Back-end Developer & QA EngineerContributions:4 reviews, 28 commits, 5 PRs in 4 months
Contributions summary:Jappie contributed to the Haskell web framework by implementing tests for error handling, including testing for allocation limits, thread kills, and async exceptions. The user also modified core framework files by adding explicit exports and async exception handling, along with refactoring and removing unnecessary code. Finally, the user bumped the version number and fixed a quote matching issue within a test related to the Yesod test suite.
haskellrestrestfulweb-framework
jappeace/gaia
Jun 2017 - Nov 2019
Contributions:14 commits, 11 pushes, 1 branch in 2 years 5 months
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