Armijn Hemel
Software Engineer
Summary
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RockstarArmijn Hemel is a software engineer in the Netherlands with 15 years of experience focused on open-source tooling, license compliance, and low-level file-format engineering. He is known as an open source license compliance engineer and former contributor to gpl-violations.org, and he built the first prototype of NixOS, reflecting strong expertise in package management and reproducible systems. His hands-on background ranges from UPnP protocol hacking to translating complex binary formats into machine-readable Kaitai Struct specifications. That blend of legal/ethical stewardship, systems-level thinking, and reverse-engineering skill makes him particularly valuable for projects requiring reproducible builds, strict license hygiene, and deep format knowledge.
16 years of coding experience
Github Skills (9)
serialization10
data-serialization10
kaitai-struct10
filetype10
file-format10
data-analysis10
image-file9
imageformats9
firmware7
Programming languages (21)
Github contributions (5)
kaitai-io/kaitai_struct_formats
Mar 2021 - Oct 2022
Kaitai Struct: library of binary file formats (.ksy)
Role in this project:
Data Engineer
Data EngineerContributions:155 reviews, 72 commits, 81 PRs in 1 year 7 months
Contributions summary:Armijn contributed to the development of file format specifications within the Kaitai Struct project, which is a domain-specific language for describing binary file formats. Their work included adding and modifying specifications for various file types, such as GIMP brush files, uImage files, ICC profiles, and various audio, image and archive formats. The contributions show a strong focus on understanding and translating file structures into Kaitai Struct descriptions. They also demonstrated proficiency in reading file format specifications, interpreting binary structures, and representing them in a machine-readable format.
file-formatmime-typesbinary-datadubnimble
armijnhemel/qr-recordlabels
Jul 2017 - Jan 2021
Contributions:18 commits, 14 pushes, 1 branch in 3 years 6 months
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