Yuki Okushi (JohnTitor)

Open source polyglot and Rustacean driving critical libraries across multiple ecosystems.

Why Sponsor Me?

Your sponsorship directly powers high-impact open source work that millions of developers rely on.

The crates I maintain have been downloaded over 1.7 billion times and power countless applications worldwide. Despite this massive impact, all of my open source work is done in my spare time, unpaid.

Every contribution helps me dedicate more time to maintaining critical infrastructure, reviewing PRs, triaging issues, and building the tools that make modern software development possible.

Support my work: https://github.com/sponsors/JohnTitor

What I Do

🦀 Rust Language & Ecosystem

As a multi-team member of the official Rust project, I help shape the language and its tooling:

Team Roles

• lang-docs team — maintaining Rust docs like The Nomicon and The Reference (in the past, I was a lead of the team)
• library-contributors team — core maintainer of rust-lang/libc, the critical FFI foundation for Rust's C interoperability
• community team — currently stopped working

In the past, I was:

• crates.io team — developing the backend infrastructure of Rust's package registry at https://crates.io
• diagnostics, prioritization, rustc-dev-guide, triage WGs — improving compiler error messages, preventing regressions, and keeping the rustc-dev-guide up-to-date

Impact on rust-lang/rust

I haven't been active recently but I was:

• Triaging issues and PRs — helping maintain the flow of contributions to the main compiler repository
• Creating rollup PRs — regularly merging multiple changes to keep development moving
• Reviewing code — ensuring quality and safety across the standard library and compiler
• Preventing regressions — catching breaking changes before they reach stable releases

🌐 Rust Community Leadership

Actix Web Framework

Lead maintainer of Actix, one of Rust's most popular web frameworks, trusted for building high-performance web applications. I collaborate closely with @robjtede and the core team to drive the project forward.

notify-rs

Active maintainer of the cross-platform file system notification library.

Writing an OS in Rust (Japanese)

Translator and reviewer for the Japanese version of Writing an OS in Rust, making low-level systems programming accessible to Japanese developers.

...and much more

From answering questions to mentoring contributors, I'm actively involved across the Rust ecosystem.

🌍 Beyond Rust

• Node.js

  • i18n Working Group member
  • Japanese proofreader for API documentation
  • Moderation team member

• semver

  • one of the maintainers

In the past:

• GNOME Foundation

  • Foundation member (2021-2025)
  • Japanese translation contributor

• LLVM

  • Committer

• Kubernetes

  • Member

How Your Sponsorship Helps

Your support enables me to:

• Maintain critical infrastructure — keeping essential libraries and tools running smoothly
• Review and merge PRs — reducing bottlenecks for contributors worldwide
• Improve documentation — making Rust and other technologies more accessible
• Prevent bugs from reaching production — through rigorous triaging and testing

Every sponsor, regardless of tier, makes a real difference. Thank you for considering supporting this work!

All of the public sponsors will be listed on my website: https://www.2k36.org/sponsors/