I need a solid connector that keeps my Shopify store and our custom backend completely in-sync in both directions. Inventory counts, new or updated products, incoming orders and the related customer records must travel flawlessly between the two systems in near real-time, with updates flowing back to Shopify just as reliably. My backend is fully custom, so the job involves working directly with the Shopify Admin REST and/or GraphQL APIs, setting up the necessary webhooks, and writing clear endpoints or workers on our side. Deliverables (all required for hand-off): • Clean, well-documented code that pushes and pulls product, inventory, order and customer data bidirectionally • Webhook and scheduler setup that guarantees no data loss, even on high-volume days • Field-mapping documentation so my internal team can maintain or extend the integration later • Basic test script or Postman collection proving typical use-cases succeed (product creation, stock change, order status update, customer edit) When everything is done I’ll validate by running live syncs in a staging store; if each data type reflects correctly in both systems within the agreed interval and logs show no errors, the project is complete.