Developer builds custom Firebase e-commerce with atomic orders and admin panel

A developer built a fully custom e-commerce system from scratch for a POS terminal reseller, using Firebase Realtime Database, Firebase Storage, and Netlify instead of any off-the-shelf platform. The store supports a small product catalog with selectable pricing variants, and allows the sales team to place orders directly from the site with the salesperson's identity automatically recorded on each order. To avoid contaminating administrative data such as salaries and budgets, the e-commerce database was kept entirely separate from the internal management panel's Firebase project. Concurrent order placement is handled through Firebase's atomic runTransaction() function, preventing duplicate order numbers when multiple vendors submit orders simultaneously. Pricing plans are stored once in a global archive and linked to products by ID, avoiding data duplication and simplifying updates across the catalog.