PrestaShop is a full-featured open-source e-commerce platform written in PHP, built on Symfony for the back-office and modern JavaScript/TypeScript for the admin interface. The codebase follows Domain-Driven Design (DDD) with a CQRS pattern, separating commands and queries into dedicated handlers. It provides a complete e-commerce backend including product, order, customer, carrier, tax, and shipping management, along with a powerful grid system, import/export engine, multi-shop and multi-language support, and an OAuth2-secured API. The architecture is a monolith with a modular domain layer, an adapter layer bridging legacy ObjectModel code, and a Symfony bundle layer for controllers, forms, and security. The admin theme uses Vue.js components and a custom grid framework with extensible columns, filters, and actions. Despite active modernization, the codebase retains significant legacy code (jQuery plugins, Smarty templates, deprecated interfaces) and exhibits a mixed architecture that introduces maintenance overhead. The repository is the core of the PrestaShop ecosystem, with a large community and extensive CI/CD pipelines.