Technical Lead · E-Commerce Integration
Overview
E-commerce platform and integration architecture for a retail operation. Designed and built the complete backend — product catalog, cart, checkout flow, payment gateway integration, logistics APIs, and order management — delivered on a compressed timeline.
The core challenge was integration: connecting a storefront to inventory, payment processors, and shipping providers through reliable API contracts that could absorb partner changes without breaking customer-facing flows.
What I built
- —Designed the full e-commerce backend architecture: product catalog management, cart and session handling, checkout pipeline, and order lifecycle management.
- —Built REST API integrations with payment gateway providers — handling authorization, capture, refund, and webhook confirmation flows.
- —Integrated logistics providers via API for shipping rate calculation, label generation, and real-time order tracking.
- —Connected inventory management system to storefront — stock availability, reservation on cart, and commit on order confirmation.
- —Built admin management tools for order operations, inventory updates, and integration monitoring.
Integration architecture
Designed an intermediary layer between the storefront and third-party providers — insulating the core platform from partner API changes. Each external integration has its own adapter with versioned contracts, so a payment provider update doesn't touch the checkout logic.