I am an independent developer mainly working on open-source software. Currently (April 2026) open to work.
My work is usually hosted under the Kaito.tokyo organization.
- My name is Kaito Udagawa
- I live in Tokyo, Japan
- My Email is
umireon at kaito.tokyo - My GitHub account is https://github.com/umireon
- My YouTube channel is https://www.youtube.com/@umireon
- My Twitch channel is https://www.twitch.tv/umireon
- My X account is https://x.com/umireon
- Mobile Development based on Fortified workflows
- Opinionated CI/CD techniques for hermetic builds
- SLSA
- System Programming in C, C++, and Go
- Web Development focusing on Accessibility and Semantics
FEBRUARY 2022 - JULY 2025, TOKYO
- Architected an on-premise iOS build farm integrated with GitHub Actions Self-hosted ephemeral runner.
- Kickstarted the end-to-end browser test with continuous integration.
- Mentored an experienced engineer from overseas.
- Reduced Scala CI duration to 1/6 of its original time.
- Set up DMARC.
MAY 2020 - JANUARY 2022, JAPAN
- Introduced multi-account governance using AWS Control Tower.
- Offshore development.
APRIL 2012 - MARCH 2021, Tokyo
- Department of Computer Science and Communications Engineering.
- Studied inter-symbol interference suppression in coded MIMO-OFDM using theoretical bit error rate for my master’s thesis.
- Published at the 19th International Conference on OFDM and Frequency Domain Techniques (ICOF2016): https://waseda.elsevierpure.com/ja/publications/inter-symbol-interference-suppression-scheme-using-periodic-signa-2/
- Arctic Code Vault Contributor (Homebrew/brew, ajaxorg/ace, semantic-release/semantic-release, and so on).
- Member of pnpm organization.
- royshil/obs-backgroundremoval: Main Maintainer / OBS plugin to remove portrait background based on AI.
- kaito-tokyo/live-backgroundremoval-lite: Owner / Clean reimplementation of obs-backgroundremoval based on ncnn.
- kaito-tokyo/vcpkg-obs-kaito-tokyo: Owner / Custom vcpkg registry with build farm for binary caches.
- kaito-tokyo/minisign-js: Owner / Secure minisign implementation in Pure JavaScript. No bundle and zero dependencies.
- kaito-tokyo/KaitoTokyo-SimpleJsonReader: Owner / Recursive Descent JSON parser for C++ with SAX-like interface. Zero dependencies and zero allocation.
- kaito-tokyo/YOLOX: Fixed version of original Megvii-BaseDetection/YOLOX.