I'm a Senior Software Engineer at PayPay in Tokyo, Japan 🗾 — one of the largest fintech platforms in the country. I've spent the better part of a decade shipping mobile applications end to end, with deep roots in the Apple ecosystem (Swift, Objective-C) and cross-platform work in Flutter and Kotlin.
I care about clean architecture, delightful UX, and tools that make other engineers faster. Lately, most of my open-source energy goes into the AI developer-tooling and coding-agent space.
- 🏢 Currently engineering at PayPay · previously effectivedigital, IntranetDASHBOARD, and Koder
- 🌏 Based in Tokyo, Japan
- 💬 Ask me about iOS / Swift, Flutter, mobile architecture, or App Store submissions
- 🎮 Fun fact: I'm a big fan of games when I need to unwind
I'm heads-down on a few things I'm keeping under wraps for now 🤫
- 🤖 Contributing to open-source AI developer tooling and coding-agent infrastructure
- ⚙️ Prototyping developer-productivity and automation experiments
- 📚 Always sharpening the fundamentals — systems, architecture, and craft
(Details coming when they're ready to share.)
| Project | What it is | My involvement |
|---|---|---|
| manaflow-ai/cmux ⭐25k+ | Ghostty-based macOS terminal built for AI coding agents | Contributing features & fixes |
| headroomlabs-ai/headroom | AI context/automation tooling | Shipped Grok Build wrap command + MCP integration |
| stablyai/orca | AI agent worktree orchestration | Contributing |
| lucas34/SwiftQueue | Reliable job scheduler for Swift | Fixed strong-reference capture in closures |
- 📝 awesome-xcode-scripts — a curated list of useful Xcode scripts · ⭐128
- ✅ Appstore-Review-Guidelines — everything to check before submitting to the App Store · ⭐90
- 🐦 100-Days-of-Flutter — source from my Flutter learning journey · ⭐57
- 🙈 awesome-gitignore-templates — handy
.gitignoretemplates by language · ⭐26
📫 Let's connect — I'm always up for a good conversation about mobile, AI tooling, or building things that matter.
Made with ☕ in Tokyo · Senior Software Engineer · iOS & Mobile Developer · Open-source contributor