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sunagw/README.md

砂川 祐介 / Yusuke Sunagawa

Full-stack Engineer / Security Specialist

🌐 Profile: sunagw.github.io

約20年のキャリアを持つフルスタックエンジニア。ビジネス要件定義から設計・実装・運用まで一人で完結し、複数の企業で技術責任者・外部CTOを務める。

Japanese full-stack engineer with ~20 years of experience, serving as technology lead / external CTO for multiple companies.

🎤 Speaking & Media

Ghana Tree Crops Summit 2026 (TCDA international conference, Accra — Feb 2026) ガーナ政府の大臣をはじめとする政府要人を前に、オイルパーム密輸対策のデジタルシステムを英語で提案・登壇。現地主要メディアに複数掲載。 Presented a non-blockchain digital system to combat oil palm smuggling before Ghanaian government ministers.

🚀 Career Highlight

Double Frontier Inc.（株式会社ダブルフロンティア） 2020–2025 — Joined a startup with zero in-house engineers, single-handedly built an online grocery platform on Saleor, became CTO, built the engineering team from scratch, and led the business to an M&A exit in 2025.

🛠 Skills

Python TypeScript Dart Java Ruby Flutter Django React/Next.js AWS GCP Kubernetes Security ML/Data

🗣 日本語 (native) / English (business) / 中文 (conversational)

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    Ethereum library, written in Dart.

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