SurveyClub

Mobile rewards platform where users earn money by completing surveys and app offers. React Native/Expo 53 frontend + NestJS 11 backend with Firebase Firestore. Integrates 8+ third-party providers (Fusion, PureSpectrum, CPX, TapResearch, RevU, AdGem, etc.). RevenueCat subscriptions, PayPal/Venmo/CashApp withdrawals, GPT-4 Vision AI for task verification. 100K+ users, processing millions in payouts.