La Win K.

I build fast, stable, and beautifully polished mobile apps using React Native, Expo, TypeScript, Swift, Kotlin, and production-grade engineering practices. My work powers 200,000+ active users, real-time applications, AI-driven pipelines, secure payment flows, and multi-platform ecosystems across iOS, Android, Web, and even Apple Watch and Wear OS. Clients hire me to: • Improve performance • Fix broken or slow apps • Build pixel-perfect UI • Implement secure authentication • Create scalable architecture • Set up CI/CD and EAS workflows • Deliver high-quality Expo or React Native builds • Rescue failing projects • Build major new app features fast and reliably My apps include consumer apps, enterprise apps, food delivery, e-commerce, real-time games, AI-powered apps, safety systems, and multi-device ecosystems. ⸻ Why clients trust me • Delivered Delivery app in Singapore (200K+ downloads) • Built large-scale Expo apps like Paper2Pod, Siam Cat Recycling • Engineered high-performance game logic and UI for ChessX • Built Apple Watch and Wear OS safety systems for Meet Leelou • Proven success with secure auth, payments, EAS pipelines, native modules, and enterprise-grade performance tuning I routinely improve apps by: • Cutting CPU usage dramatically (ChessX: 30 percent to 5 percent) • Reducing cold start times • Fixing re-render storms and list lag • Optimizing Skia, Reanimated, and FlashList • Implementing airtight security and secrets management • Hardening navigation, deep linking, and persistence logic • Stabilizing crashes and production edge cases