Hassa n S h ah id

Engineered business-critical e-commerce functionality on a live enterprise platform, adding channels without destabilizing existing marketplace workflows. Architected integration boundaries with repositories, service layers, interfaces, and DTOs to keep external platforms decoupled from core domain models. Designed multi-store synchronization for products, inventory, and orders using per-store reference mapping rather than rewriting external IDs into the core catalog. Led Shopify GraphQL, webhooks, and queue-driven flows for safe asynchronous catalog and order updates. Owned backend decisions across database design, integration contracts, deployments, and production troubleshooting, translating business requirements into delivery plans with stakeholders.

Owned the technical direction of a commercial device e-commerce platform spanning catalog, inventory, customers, orders, and operational workflows. Architected Laravel backend modules and APIs that power the Next.js storefront and internal tools. Integrated PayPal, Afterpay, Meli e-search, and related services into the live order path. Led engineers through design reviews and delivery standards while staying hands-on in implementations. Diagnosed production failures and improved slow paths in catalog and checkout.

Architected Laravel and Node.js backends, including REST APIs and service boundaries for client platforms. Integrated React clients against those APIs and kept contracts stable while moving features to production. Improved performance through caching, query work, and database tuning for live workloads. Raised implementation quality via code reviews and guidance for junior engineers.