This is a comprehensive e-commerce backend platform built with Spring Boot 3.5+, JDK 17, and a multi-module Maven architecture. In production, it serves two distinct APIs: `mall-admin` (admin management) and `mall-portal` (customer-facing storefront), plus a dedicated `mall-search` module for Elasticsearch-powered product search. The system handles product cataloging, order lifecycle management, user registration/authentication, coupon and promotion calculations, shopping cart operations, payment integration (Alipay), and content management (home page banners, recommendations). It uses MySQL as the primary database via MyBatis (with generated mappers), Redis for caching and session management, MongoDB for user activity data (browsing history, favorites), RabbitMQ for delayed order cancellation, and MinIO/Aliyun OSS for file storage. Security is implemented with Spring Security and JWT, including dynamic path-based authorization. The codebase follows a layered architecture (Controller → Service → Mapper/DAO) with shared modules `mall-common` and `mall-security` providing reusable utilities for API responses, pagination, exception handling, Redis caching, and authentication. While heavily reliant on MyBatis Generator for data access objects and includes some long service methods, the overall structure is well-organized and modular, making it suitable as a reference for similar e-commerce projects. No data research or analytical components are present; this is purely an application codebase.