Tokyo-based 🥷 engineer focused on open-source wallets, cryptography, and tooling. I'm currently deep in Rust, ZK, and LLM agents—building in public and sharing everything I learn.
- 🔐 hw-core – Cross-platform hardware wallet interface with Trezor Host Protocol support.
- 🎛️ Control Room – Unified session control interface for different coding agents (Claude, Codex, etc.) with JayJay's diff UX.
- 🧮 clifpad – Native scratchpad for Cranelift IR: agents write CLIF, it JIT-compiles and runs in an isolated worker, and every run reports value, optimized IR, disassembly, and timing. Ships an MCP server.
- ⛓️ solana-primitives – Core primitives for Solana blockchain development.
- 🦀 reqwest-enum – Type-safe, enum-style HTTP API for reqwest.
- 📦 aya-devcontainer – Pre-configured Docker image for eBPF programming with Rust.
- 🐦 jayjay – Native macOS GUI for Jujutsu (jj) version control. Rust core + SwiftUI shell.
- 🚀 Remote Launcher Native macOS launcher for multiple High Performance Screen Sharing sessions.
- 🌐 MISO – Lightweight menu bar HUD overlay for quick input method switching.
- 🕵️ app-detective – Detect macOS apps' GUI tech stack.
- 👻 ghosttile-cli – Hide apps from the macOS Dock (CLI, menu bar app, and Raycast extension). Website.
- 🚀 StagedLauncher – Manage and delay app launches across stages on your Mac.
- 🎧 hearvia – Live translated subtitles for anything you hear, on iPhone and Mac. Apple on-device, OpenAI Realtime, Gemini Live, or a local model.
- 🕐 anytime – Timezone-aware world clock for Mac and iPhone. App Store.
- 🔍 inspect – iOS/macOS app with Safari web extension, share extension, and passive TLS monitoring for HTTPS certificates. App Store.
- 🧪Zoey's Lab - Educational free web app built with my daughter
- 🔏 Crypto Playground - Interactive, visual cryptography from Caesar ciphers to SNARKs and lattices, running on small real numbers
- 🏯 Budokan event today - Quick way to view today's event in Budokan
- 🔤 Hanori - Experimental English font
- 🔧 BTMParser – Parse BTM (Binary Task Manager) files on macOS.
- 📱 LSAppCategory – LSApplicationCategoryType lookup for macOS apps.
- 🖥️ github-desktop – Added Open Repository in New Window support.
- 🔀 diffnav – Added difftastic as a diff engine.
If my work powers your stack or inspires you, consider sponsoring so I can keep shipping. Every sponsorship goes directly into more OSS time: shipping new libraries, improving docs, responding to issues, and mentoring developers exploring crypto + agents.
As a former staff blockchain engineer at Trust Wallet, I shipped and maintained critical infrastructure used by millions:
- 📱 Trust Wallet iOS – One of the most-used mobile wallets (active since 2018).
- 🏛️ Wallet Core – Cross-chain/core library powering the extension + mobile apps.
- 🏛️ WalletConnect Swift – First usable WalletConnect v1 SDK in Swift.
- 📦 Trust Web3 Provider – Multi-platform Web3 provider.
- 📦 ens-coincodec – ENS address encoding/decoding.
- 📦 blockbook – Trezor address/account backend.
- …and a handful of redacted-but-impactful contributions.