Full-stack engineer focused on AI-agent systems and real-time, high-concurrency products — the exact surface an agentic trading product lives on. At ELESTYLE (Tokyo fintech) I build a PCI-DSS v4.0 payment platform serving 200k+ merchants nationwide, going deep on MQTT real-time messaging and PostgreSQL / Redis data modeling with reliable delivery under load.

I ship AI agents end to end. My flight-monitor agent uses GPT-4o as its decision core (Tool Calling + Function Calling) to watch multi-source pricing via Playwright, store history in TiDB, and push alerts through a Telegram bot — Dockerized, with an MCP server. It's the same monitor → analyze → recommend → alert loop a trading agent runs.

Web to mobile — exactly this role: React / Next.js on the web and Flutter on mobile. I also design, build, and operate products solo — StarFlix (star-flix.cc) is a Next.js full-stack streaming platform I run end to end, from product to ops.

AI-native by default: I work daily in Claude Code / OpenAI Codex / VS Code, with AI tooling fully woven into my workflow — so "proficient with AI coding tools" isn't a claim, it's already how I ship.

Active open-source contributor — merged PRs to yt-dlp (90k+ ★), vitejs/vite-plugin-react, and cloudflare/vinext; author of unplugin-version-injector on npm. Fluent technical English; overlaps well with GMT+8 hours from Tokyo.