Jan-joost Spanjers
Freelance Ruby On Rails Developer at Hiberis ICT
Nijmegen, Gelderland, Netherlands
Summary
👤
Senior🎓
Top SchoolJan-joost Spanjers is a Freelance Ruby on Rails developer based in Nijmegen with 11 years of professional experience building reliable backend systems and consulting for product teams. Trained as a physicist (MSc) and later educated in logistics, he brings a methodical, analytical mindset and strong attention to detail to software design and problem solving. He has senior engineering and consulting experience across startups and agencies, and currently combines freelance work with a senior engineering background at Xurrent and Forque. Jan-joost contributes to notable open-source projects such as the official rubyzip library, where he improved decompressor plugin support, encryption handling, and core file processing—work that reflects a focus on robustness and maintainability. Known as responsible, thoughtful, and persistent, he pairs deep technical craftsmanship with practical delivery and cross-functional collaboration.
11 years of coding experience
21 years of employment as a software developer
Logistics, Materials, and Supply Chain Management, Logistics, Materials, and Supply Chain Management at Open UniversiteitMaster of Science - MS, Physics, Master of Science - MS, Physics at Radboud University Nijmegen
English, Dutch
Github Skills (5)
deco10
deflate10
encryption10
ruby10
testing9
Programming languages (7)
Github contributions (5)
rubyzip/rubyzip
Dec 2019 - Jun 2021
Official Rubyzip repository
Role in this project:
Back-end Developer
Back-end DeveloperContributions:3 reviews, 32 commits, 6 PRs in 1 year 5 months
Contributions summary:Jan-joost primarily contributed to the `rubyzip/rubyzip` repository by implementing and refactoring core functionalities related to zip file processing. Their work involved adding support for decompressor plugins, enhancing encryption and decryption capabilities, and improving the handling of stored files. They also fixed bugs and improved the internal structure of the library by, for example, removing unused variables.
rubyzipencryptionrubyaes-encryptionzip
jspanjers/rubyzip
Nov 2019 - Jun 2021
Offical Rubyzip repository
Contributions:5 PRs, 106 pushes, 7 branches in 1 year 6 months
railsruby-gemmrubyruby
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