About

Naohiro YozaSystems Engineer

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.

I love basketball.

• Owning the whole product

  I handle everything myself, from deciding whose problem to solve to design, implementation, testing, launch, and operations. I care about building things that keep running, not just things that ship.

• Trust enforced by design

  In Himotoku AI, answers cannot be tampered with; in B.PREDICT, predictions cannot be changed after tip-off. Both guarantees live in the database layer. I prefer structural guarantees over "being careful".

• Zero running cost

  To keep personal products alive for the long run, I aim for zero running cost. I design around free-tier limits with static delivery and in-browser execution.

• Turning AI and statistics into products

  From a machine learning course to statistical game predictions, I turn AI and statistical methods into real services, designing not only the models but also how they are evaluated and presented.

Collected automatically from the tech stacks of the projects on this site.

• Cloudflare WorkersUsed in: Himotoku AI, Koukin Map
• GitHub ActionsUsed in: Himotoku AI, B.PREDICT (working title)
• Next.js 16Used in: Himotoku AI, B.PREDICT (working title)
• TypeScriptUsed in: Himotoku AI, B.PREDICT (working title)
• Cloudflare D1Used in: B.PREDICT (working title)
• Cloudflare TurnstileUsed in: Himotoku AI
• Cloudflare Workers / HonoUsed in: B.PREDICT (working title)
• CodeMirrorUsed in: Himotoku AI
• fontToolsUsed in: Koukin Map
• Google FormsUsed in: Koukin Map
• HTML / JavaScriptUsed in: Koukin Map
• JSON SchemaUsed in: Koukin Map
• Leaflet / GSI tilesUsed in: Koukin Map
• LightGBMUsed in: B.PREDICT (working title)
• MDX / KaTeXUsed in: Himotoku AI
• openpyxl / xlrdUsed in: Koukin Map
• pdfminer.six / pypdfUsed in: Koukin Map
• Playwright / axe-coreUsed in: Himotoku AI
• PyodideUsed in: Himotoku AI
• PythonUsed in: Koukin Map
• Python 3.12Used in: B.PREDICT (working title)
• ResendUsed in: Himotoku AI
• SentryUsed in: Himotoku AI
• SupabaseUsed in: Himotoku AI
• Tailwind CSSUsed in: Himotoku AI
• Vitest / PGliteUsed in: Himotoku AI