Custom Warehouse Management System (WMS) Developer – Shopify Integration

We are looking for an experienced full-stack developer or development team to build a custom Warehouse Management System (WMS) that integrates directly with our Shopify store. This is not a Shopify app customization—we want to build our own standalone WMS tailored specifically to our warehouse operations, with the ability to expand as our business grows. Required Experience Building Warehouse Management Systems (WMS) Shopify API (Admin API & Webhooks) Inventory management software Barcode scanning workflows Order fulfillment systems REST APIs Database architecture Experience with warehouses and logistics Please include examples of any WMS, ERP, inventory, or fulfillment software you've built. Core Features Inventory Management Live inventory synced with Shopify Multiple warehouse/bin locations Inventory adjustments Stock transfers between locations Cycle counts Low inventory alerts Order Management Import Shopify orders automatically Order status synchronization Picking queue Packing workflow Shipping status updates Partial shipments Backorders Picking & Packing Pick lists Barcode scanning Verify products before packing Print packing slips Print shipping labels Batch picking Receiving Receive purchase orders Barcode scanning Assign products to warehouse locations Quantity verification Products Product images SKUs Variants Barcode support Product search Warehouse Locations Aisles Shelves Bins Custom warehouse mapping Reporting Inventory valuation Inventory history Order fulfillment metrics Stock movement reports Picking performance User Management Multiple employee accounts Permissions & roles Activity logs Shopify Integration The software should sync with Shopify in real time. This includes: Orders Products Inventory Customers Fulfillment status Tracking numbers Nice to Have Mobile-friendly interface Tablet support Barcode scanner compatibility Label printer support (Zebra, Brother, etc.) Future support for multiple Shopify stores API-first architecture Technology We're open to recommendations, but we're looking for a modern, scalable stack such as: React / Next.js Node.js, Go, or Laravel PostgreSQL or MySQL Docker Cloud deployment (AWS, DigitalOcean, etc.) To Apply Please include: Examples of WMS or inventory systems you've built. Your recommended tech stack. Estimated timeline. Estimated budget. Any suggestions for features we should include. We're looking for someone interested in a long-term relationship, as this software will continue to evolve with new features after the initial version is completed.