Senior Android Architect & Indie Product Builder
Joy Zhao
I build production-ready Android apps,
AI-powered tools,
and scalable web products.
20+ years of software engineering experience.
What I Build
Results, not buzzwords. Here is what I deliver.
Android Apps
- Lego Architecture
- Native Android
- MVVM
- Clean Architecture
- Modularization
AI Integration
- OpenAI
- Claude
- Gemini
- Streaming
- RAG
- On-device LLM
Backend
- Spring Boot
- Node.js
- REST API
- Authentication
SEO Products
- Next.js
- SSG
- Structured Data
- Core Web Vitals
Featured Projects
Flagship Android architecture, production apps, and indie products.
Modern Android Architecture
liveFlagship demo of Lego Architecture — divide and conquer taken to the extreme
FlagshipLego ArchitectureModularizationDesign Patterns
Kongfz — 孔夫子旧书网
liveProduction Android & iOS app for China's largest used-book marketplace
Production ScaleE-commerceOnline AuctionMillions of Users
US Mortgage Toolkit
liveSEO-first mortgage calculator platform with 10+ tools and 44+ articles for the US market
Live DemoSEO10+ Calculators44+ Articles
Buddy — AI Travel Companion
liveImmersive walk-and-listen AI travel app with dual companion personas
Live DemoAI CompanionsWalk & ListenTTS