Engineered a high-performance e-commerce platform with role-based access control (RBAC) and token-based authentication (Laravel Sanctum) for secure user management. Implemented a repository-service architecture with Redis caching (Docker) to optimize backend performance. Developed checkout session generation, webhook-based payment synchronization, and real-time payment status notifications using WebSockets for seamless transaction handling. Built a type-safe React frontend with Redux state management, lazy loading, and optimized cart computations for fast, interactive shopping experiences. Additional features include dynamic product listings, user-specific dashboards, and scalable architecture ready for high traffic.