Portfolio

Selected work.

A few of the products we have designed, built and shipped — from public brands to engagements under NDA.

Mobile · EdTech · AI

JOL

A game-based corporate learning platform from NUTS Inc. (Tokyo). We built the learner mobile app for iOS and Android — gamified quests, AI-driven weak-spot practice, and a multilingual UI for foreign employees preparing for the JLPT.

7+languages supported in-app

React NativeExpoNestJSGraphQLOpenAIFirebase

Medical · University

Japan Biodesign Osaka

Official site for Osaka University’s medical-device innovation program, run in partnership with Stanford Biodesign. We rebranded and rebuilt the site and launched the Fellowship 2026 recruitment pages — with news and recruiting managed from a single source so staff can update without a developer.

StanfordBiodesign partner program

Next.jsTypeScriptTailwind CSSMDXVercel

E-commerce

Chunky Academy

A premium California hemp brand. We built the storefront, subscription ("Lunch Box") flow, and lab-result transparency — and helped grow monthly revenue roughly 7.5×, from ¥4M to ¥30M. Now 10,000+ customers at a 4.9★ rating.

7.5×monthly revenue growth

Next.jsHeadless CommerceStripeVercel

Brand & E-commerce

Leafire

An indoor cannabis cultivator with a "grown loud, built clean" ethos. A minimal, photography-led site that lets the product and craft carry the brand.

20+cultivars showcased

Next.jsTailwind CSSMotionVercel

EdTech · AI

EngPrep

An AI-powered TOEFL iBT prep app with instant Japanese feedback across Speaking, Writing, Reading, and Listening. 100+ customers — one learner raised their score from 40 to 65 in a month.

40→65TOEFL score in 1 month

Next.jsOpenAISupabaseStripeVercel

E-commerce · Tech Lead

NDA

E-commerce · Tech Lead

Japan's largest flower commerce platform

Led engineering for a high-traffic commerce platform, shipping a re-architected storefront and order pipeline. (Client under NDA.)

Tech Leadhigh-traffic commerce platform

Next.jsNest.jsHasuraSupabase

AI Infrastructure

NDA

AI Infrastructure

RAG system for a major automotive brand

Built a retrieval-augmented generation system and the cloud AI infrastructure behind it, deployed across 10+ companies on Google Cloud. (Client under NDA.)

10+companies in production

Google CloudLangChainPythonVector DB

FinTech · CTO

NDA

FinTech · CTO

Gen Z personal finance app

As CTO, built a gamified personal-finance mobile app for a Gen Z audience, owning architecture and the engineering roadmap end to end. (Product under NDA.)

CTOrole · 0→1 product

React NativeNest.jsPostgreSQL