Multi-vendor marketplace with embedded retail channel

The challenge

The client wanted to sell third-party devices and packages under its own brand, give vendors a place to run their business, and govern catalog, orders and finance centrally. The marketplace also had to be available inside the retail point of sale as well as online.

What we built

Microservices with a PostgreSQL database per service, Redis, Elasticsearch for product search and object storage for files. The order flow runs on Kafka with topics for logistics orders, cart deletion, inventory updates, gift-card reversal and notifications; scheduled jobs handle reservation timeouts, pending payments and transaction checks.

• Catalog with vendor offers, bundles, discounts, homepage widgets and banners.
• Cart with delivery and payment methods, gift-card validation and merge on login.
• Order lifecycle: reservation, payment by gateway, in-store terminal or pay-by-link, invoicing, vendor fulfilment, barcode and serial tracking, revenue sharing and gift-card redemption.
• Operations: scheduled exports and reconciliation to analytics and configuration backups.

Front ends for store, vendor and admin were built on Next.js with right-to-left support. A channel header distinguishes store, vendor, admin and embedded traffic for routing and permissions.