Sep 2025 – Present
Gaudiy, Inc.
Senior Frontend Engineer · Tokyo (Remote)
Leading frontend across a client-facing AI demo product and a cross-product design system at this Web3/blockchain fan engagement platform. Built a Digital Twin PoC with React, Three.js, and FastAPI demoed to Aniplex and Sony. Architected a 3-layer design token system and standardized LLM-first dev workflows team-wide.
React
Three.js
Design Tokens
AI Workflows
Oct 2023 – Jul 2025
Tailor, Inc.
Frontend Engineer · Tokyo (Remote)
Console Application team at this Y Combinator-backed headless ERP startup ($22M Series A). Developed and enhanced the Console Application, the primary tool for managing Tailor platform workspaces and applications.
Y Combinator
ERP Platform
Console App
Jun 2021 – Jun 2024
JAMSTEC
Full Stack Engineer (Contract) · Yokohama (Remote)
Built an analytics dashboard for fleet, equipment, and cruise evaluation. React/Next.js frontend with .NET 6/C# backend. Migrated evaluation data from spreadsheets to PostgreSQL and served as technical consultant for vendor projects.
Next.js
.NET 6
PostgreSQL
Jun 2021 – Sep 2023
Mercari, Inc.
Software Engineer · Tokyo (Remote)
Developed the shop and admin dashboard for Pacific League Exciting Moments (baseball NFTs). Owned the frontend release pipeline with GitHub Actions and GCP, and mentored external contractors.
React
Vue.js
NFTs
GCP
Aug 2020 – May 2021
TAAL Technologies
Software Engineer & Team Lead · Switzerland (Remote)
Joined at inception. Built and led the UI/UX and Web Development team (2 junior engineers + 1 designer). Developed the customer portal, admin dashboard, and co-designed the company brand.
Team Lead
Blockchain
Brand
Feb 2019 – Aug 2020
bitFlyer Group, Inc.
Frontend Engineer · Tokyo
Sole web frontend engineer across Japan, US, and EU platforms. Pioneered A/B testing that nearly tripled conversion while cutting CPA by 69%. Built the buy/sell platform from scratch and developed the T-Point exchange partnership with TSUTAYA.
Vue.js
A/B Testing
3x Conversion
2014 – Feb 2019
Freelance
Web Developer & Digital Marketing Consultant · Tokyo
Independent consultant providing web development and digital marketing services, bridging technical implementation with marketing strategy for diverse clients across Japan.
Freelance
Digital Strategy