Fantao Meng

Full Stack Developer at Koupon (koupon.ai)

Led full-stack development for a coupon-driven e-commerce platform with web app, mobile app, and admin dashboard. Built responsive UIs using React and TypeScript with MUI, delivering curated product collections, detail pages, and feedback systems for 1M+ users and 10M+ deals across 7 major retailers. Implemented end-to-end data flows for promo-code verification, user-usage recording, and issue reporting via React frontend, Next.js BFF, Firebase, and Redis caching; created RESTful APIs, reducing invalid deal reports by 91%. Optimized SEO and performance with metadata, lazy loading, and SSR, and built a React Native app with web feature parity. Created marketing features, analytics integration with GA/BigQuery, and an internal admin panel to configure collections and hero sections, dropping deployment time from hours to minutes. Mentored 3 junior developers and contributed to CI/CD via Vercel and Turborepo.