Multi-role supermarket management system built on Java Spring Boot with role-based access control for customers, supervisors, coordinators, and executives. All user types authenticate through a centralized User Management layer before accessing the Spring Boot web application, which orchestrates six core modules: Product, Cart, Order, Inventory, Delivery, and Payment Management. The architecture separates business logic into modular services that interact with a Central Database and third-party Payment Gateway, enabling independent scaling of inventory tracking, order fulfillment, and delivery operations. This design demonstrates enterprise-grade separation of concerns and multi-stakeholder workflows essential for retail operations at scale. Fork this diagram on Diagrams.so to customize role hierarchies, add AWS services like RDS or Lambda, or extend with real-time notifications and analytics.