Web App Developer for Paint Shop

We’re building a custom web app for a paint shop that tracks orders from intake through prep, painting, QA, and shipping, then invoices from client-specific price lists. The design is complete: a 37-table database, process flows, clickable mockups, and written business rules. First milestone includes order intake that splits orders into sub-orders by product type and colours, parts classified as paintable, service, or product, client-specific pricing without hand-typed prices, custom colours putting orders on hold, and separate secretary and manager roles with a manager dashboard. Later phases include production board, invoice review, annual price lists, and QuickBooks Online integration. Launch is planned for March 2027. We need someone who follows the database design and specs, communicates clearly, and works efficiently on desktop and shop-floor tablets. QuickBooks API experience is a plus.