•Built a modular, scalable e-commerce backend with NestJS and MongoDB.
•Implemented JWT authentication with role-based access control (admin, seller, customer).
•Integrated Stripe Checkout, achieving real-time payments/refunds with <2s latency.
•Reduced product load time by 60% with Redis caching and real-time updates via Socket.IO.
•Developed full CRUD for orders, products, categories, and cart models, supporting 3 user roles.