A comprehensive commerce management system unifying online sales, in-store sales, and inventory in one platform. Built around four dedicated spaces: customer (catalog, cart, orders, favorites), sales staff (in-store transactions, scanning, invoicing, reports), stock staff (scanning, alerts, restocking), and admin (users, products, orders, statistics). The core technical challenge was architecting a system that handles multiple user roles with distinct permissions and workflows, while keeping data synchronized in real time across all four spaces.