Leo Izen
Full Stack Software Developer at Provision IAM
Ann Arbor, Michigan, United States
Summary
🤩
Rockstar🎓
Top SchoolLeo Izen is a full stack software developer based in Ann Arbor with 12 years of hands-on experience spanning backend, frontend, portable C, and image processing. A recent University of Michigan graduate, he pairs practical web development skills with deep contributions to open-source image projects—most notably work on the JPEG XL reference implementation and a FLIF GdkPixbuf loader that improved memory use and stability. He also improves developer UX as a technical writer for mpv, documenting features like JPEG XL support. Comfortable across the stack and in low-level image encoding details, Leo brings both systems-level rigor and clear technical communication to product teams. He’s active in developer communities (and even runs a Discord), signaling an appetite for collaboration and continued learning.
12 years of coding experience
University of Michigan College of Literature, Science, and the Arts
Stackoverflow
4,220reputation
1.0mreached
82answers
43questions
java
top-5%
Github Skills (30)
c-language10
jpeg-xl10
encoder10
command-line-interface10
c1110
mpv10
c1710
encode10
cprogramming-language10
gdk-pixbuf10
documentation10
image-compression10
decode9
java9
codec9
Programming languages (12)
Github contributions (5)
mpv-player/mpv
Jun 2017 - Oct 2022
🎥 Command line media player
Role in this project:
Technical Writer
Technical WriterContributions:80 reviews, 38 commits, 123 PRs in 5 years 5 months
Contributions summary:Leo primarily contributed to the project by updating and improving the project's documentation. Their commits focused on refining the man pages, providing better explanations of existing options, documenting new features such as the addition of JPEG XL support, and correcting existing documentation. The changes enhanced the usability of the command-line media player for users by providing clearer instructions.
mpvlibavplayeraudiovideo-player
libjxl/libjxl
Nov 2021 - Nov 2022
JPEG XL image format reference implementation
Role in this project:Back-end Developer
Back-end DeveloperContributions:21 reviews, 10 commits, 26 PRs in 11 months
Contributions summary:Leo primarily contributed to the JPEG XL image format reference implementation, focusing on enhancements and fixes related to the encoding process. They addressed issues with color encoding, specifically in the handling of XYB color spaces and added checks and fallback mechanisms. Additionally, the user made updates to build scripts and CLI tools, improving the functionality and usability of the project.
lossless-image-compressionjpegimagelossless-compression-algorithmpsd
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