Built a high-performance React Native dictionary app with over 300,000 words and proverbs, currently live in production serving real users. Handled full-stack responsibilities including data cleaning, SQLite optimization for offline performance, and modern UI design with Expo and NativeWind. Delivered smooth offline functionality, fast search and navigation, and a visually polished, intuitive experience. A production mobile MVP focused on performance, reliability, and real-world usability at scale.