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Achievements

Achievement: Galaxy Brainx3Achievement: Pair Extraordinairex3Achievement: QuickdrawAchievement: YOLOAchievement: StarstruckAchievement: Arctic Code Vault ContributorAchievement: Pull Sharkx3

Achievements

Achievement: Galaxy Brainx3Achievement: Pair Extraordinairex3Achievement: QuickdrawAchievement: YOLOAchievement: StarstruckAchievement: Arctic Code Vault ContributorAchievement: Pull Sharkx3

Highlights

  • Pro

Organizations

@arch8jp

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yhay81/README.md
Yusuke Hayashi — reliable software, practical AI, production delivery

Portfolio · Haya Inc. · Zenn · LinkedIn · Email

I build reliable software and guide teams into shipping it. Based in Tokyo, I work across AI systems, web and cloud engineering, and the delivery practices that turn prototypes into dependable products.

Selected work

pylopdf — A lightweight Python/Rust toolkit for editing and rendering PDFs, designed around small wheels and zero runtime dependencies.
Python Rust PDF

GASlacker — A Slack Web API client for Google Apps Script, rebuilt for practical automation, file uploads, and resilient API workflows.
Google Apps Script Slack API Open source

Production AI at Haya Inc. — LLM integration, RAG pipelines, evaluation, and workflow redesign—from technical framing through production rollout.
AI adoption System design Team enablement

Current focus

Production-grade AI systems · reliable Python/Rust tooling · delivery systems that teams can own and operate.

Latest writing

Outside work, I am usually on a road bike. For consulting or project inquiries, visit Haya Inc. or get in touch.

Pinned Loading

  1. hayatepy/hayate hayatepy/hayate Public

    Web-standards-first Python framework: WHATWG Fetch / URL / URLPattern across ASGI, Cloudflare Workers, and AWS Lambda

    Python

  2. haya-inc/wasmhatch haya-inc/wasmhatch Public

    The AI assistant that actually does the work — right in your browser tab. No server, no install, no account. Bring your own key or use Chrome's built-in AI; creates Google Docs, Sheets, and Slides;…

    TypeScript 1 6

  3. pylopdf pylopdf Public

    PDF editing and rendering for Python, powered by Rust (lopdf + hayro). MIT, zero dependencies, lightweight wheels.

    Python

  4. GASlacker GASlacker Public

    Slack Web API client for Google Apps Script — 168 methods, rate-limit retries, file uploads, OAuth v2, zero runtime dependencies

    TypeScript 30 10

  5. profile profile Public

    Yusuke Hayashi's profile page

    JavaScript 1

  6. public-data-catalog public-data-catalog Public

    Japanese-first, tested recipes for reproducible public-data retrieval with provenance, licensing, and freshness checks.

    Python