Hey, I'm TTsubasa!
I'm a software engineer based in Japan, currently building products at GAOGAO. Keio University graduate, former banker turned engineer.
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Experience
Where I've worked and studied.
2019 — Now
GAOGAO — Software EngineerJoined as an early member (10 people) and grew with the company to 70+. Launched and operated the Vietnam branch (2022–2024). Building AI-powered products with Mastra / Vercel AI SDK / Claude. Mentor at GAOGAO Gate engineer training program since 2019.
2018
The Shoko Chukin Bank, Ltd.
2018
Keio University — Faculty of EconomicsOutstanding Thesis Award 2017 (Game Theory seminar).
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Certifications
Claude Certified Architect — Foundations (CCA-F)2026
TOEIC 9252024
AWS Certified Solutions Architect – Associate2021
日商簿記2級2016
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Works
Things I've built and contributed to.
Our Time
Visualizes remaining meetings with loved ones based on lifespan. Widgets, 6 themes. Solo-developed.
IELTS DiaryAI-powered English diary app for IELTS learners. Flutter + Gemini. Solo-developed from concept to App Store release.
OSS Contributions
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Links
Find me around the web.