Sumit K.

Full-stack engineer (5+ years) building Shopify apps and API integrations for 3PL, WMS and carrier fulfillment flows. I keep orders, inventory and shipments in sync across Shopify, your 3PL and carriers, so failures get caught before customers notice. What I work on • Shopify apps (Next.js, Node.js, TypeScript): Admin API, webhooks, order and inventory sync, app billing (for example, Falcon CRO); Shopify and Shopify Plus • API integration: connecting Shopify to 3PLs, WMS and inventory or order-management systems, with carrier and tracking data • Fulfillment and shipping flows: order routing, tracking updates, 3PL and carrier handoffs • Reliability: queues, retries, idempotency, monitoring and reconciliation, so duplicate orders and silent sync failures don't slip through • Rescuing AI-generated prototypes: tests, audit trail, a clean data model Where I'm focused Logistics integration (3PL, carrier APIs, EDI). I'm publishing working examples as I go, and I'm upfront about what I've already shipped versus what I'm still learning. How we can start A fixed-price integration health check: I review your Shopify, 3PL/WMS and carrier flows (or your app or prototype), trace stuck, duplicate or missing orders and inventory drift, and give you a ranked fix plan with a timeline. Carrier API migrations, for example off the retired USPS Web Tools APIs, are also available at a fixed price. From there we can work in milestone-based builds or on a monthly monitoring retainer. To get you a useful quote fast, send me three things: your platform (Shopify or Plus), your 3PL or WMS, and the one thing that breaks most often. Available 30+ hours a week, with daily overlap for UK and US East Coast mornings.