Kaito Udagawa's profile

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

Skills

• 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

Experience

Monoxer, Inc. / Site Reliability Engineer

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.

Ricksoft, Inc. / Junior Software Engineer

MAY 2020 - JANUARY 2022, JAPAN

• Introduced multi-account governance using AWS Control Tower.
• Offshore development.

Education

WASEDA University / Master, Computer Science and Communications Engineering

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/

Awards

• Arctic Code Vault Contributor (Homebrew/brew, ajaxorg/ace, semantic-release/semantic-release, and so on).
• Member of pnpm organization.

My work

• 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.