Speed is everything when validating a product idea. This case study walks through how I took the QuizMaster mobile app from concept to production in just 3 weeks using React Native. You'll discover: My rapid prototyping workflow and tooling setup, How to choose between Expo and React Native CLI, Firebase integration for quick backend setup (auth, real-time database, analytics), Performance optimization techniques for 60fps animations, App Store & Google Play deployment strategies, Common pitfalls to avoid when building cross-platform apps. Perfect for founders and developers who need to move fast without sacrificing quality.