Portfolio · Haya Inc. · Zenn · LinkedIn · Email
Software engineer × product builder, based in Tokyo.
I turn ambiguous problems into production systems—architecture, implementation, evaluation, delivery, and operation.
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01 / AI SYSTEMS LLM integration, RAG pipelines, evaluation, and human-in-the-loop workflows designed for production constraints. LLM RAG EVALS
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02 / SYSTEMS & TOOLING Small, dependable developer tools with clear APIs, native performance, and low operational cost. PYTHON RUST APIs
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03 / DELIVERY Cloud architecture, CI/CD, observability, and team practices that carry software safely into operation. CLOUD CI/CD OPS
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| Project | Engineering signal | Live OSS telemetry |
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| pylopdf | Python ergonomics over a Rust PDF core; small wheels and zero runtime dependencies. | ★ 1 forks 0 · Python / Rust |
| GASlacker | A production-minded Slack Web API client: 168 methods, rate-limit retries, uploads, and OAuth v2. | ★ 30 forks 10 · TypeScript / GAS |
| public-data-catalog | AI-friendly public API and dataset metadata, published in machine-readable form. | ★ 0 forks 0 · Python / Data |
Current operating loop · frame the problem → model the system → ship a thin slice → measure reality → harden what matters
At Haya Inc., I work on production AI adoption and the engineering systems around it—from technical framing through rollout and team enablement.
First-party public GitHub signals, regenerated daily with a versioned API and no coding-time vanity metrics.
- 候補者の状態から逆算する、ベンチャーのエンジニア採用チャネル設計 — 2026-07-25
- Sigstore入門：どこで使われ、どう使えるのか — 2026-07-24
- Google Apps Script向けSlack APIクライアントOSS「GASlacker」を作り直した — 2026-07-22
Outside work, I am usually on a road bike. For consulting, product engineering, or AI adoption inquiries, visit Haya Inc. or get in touch.