A learning service that starts from middle-school math and leads learners to understand how AI works, through both equations and Python code, and to build AI models themselves.
- Next.js 16
- TypeScript
- Tailwind CSS
- MDX / KaTeX
- Pyodide
- CodeMirror
Naohiro Yoza — Systems Engineer
An engineer who builds products end to end, from planning to operations
I have worked as a systems engineer for five years. On my own, I also build products end to end, from planning and design to development, launch, and operations. I specialize in turning AI and statistical methods into services people can actually use.
Personal projects
An unofficial tool that predicts B.LEAGUE win probabilities, scores, and player stats with statistical models, and openly publishes the reasoning behind each prediction along with its own track record.
- Next.js 16
- TypeScript
- Cloudflare Workers / Hono
- Cloudflare D1
- Python 3.12
- LightGBM
A service that covers every line of revenue and spending for Okinawa Prefecture and its 41 municipalities, down to the finest level of their budget and settlement books, so anyone can check where tax money goes, with sources.
- HTML / JavaScript
- Python
- pdfminer.six / pypdf
- fontTools
- openpyxl / xlrd
- JSON Schema
A browser game for smartphones where you compete on Japanese flick-input speed. No install needed. Play a 60-second time attack, or HP-style battles against friends and players across Japan.
- React 19 / Vite
- TypeScript
- Cloudflare Workers / Hono
- Cloudflare D1
- Cloudflare KV
- Durable Objects (WebSocket Hibernation)
Let’s talk
I welcome work inquiries, questions, and feedback about my projects.