Construction Materials Ordering Mobile App

I run a construction–grade raw-material business and I’m ready to move the entire ordering and delivery flow onto a mobile platform. The goal is a single code-base (Android and iOS) where buyers can: • Browse every material I stock – sand, gravel, cement, bricks, steel, aggregates, anything I add in the future. • View clear details for each item: price, selling unit, and current available quantity. • Select products, enter the required quantity, and place the order in a straightforward checkout. • Pay either online (UPI, card, net-banking, wallet) before delivery or mark the order as post-paid for cash/credit settlement on receipt. On my side I must be able to update inventory, edit prices and units, confirm or reject orders, and mark them shipped or delivered. A slim web or in-app admin panel works as long as it is secure and intuitive. Deliverables • Production-ready Android and iOS apps, fully tested and store-submission compliant • Admin dashboard connected to the same database (Firebase, Supabase, custom API—open to your recommendation) • Payment gateway integration covering both prepaid and post-paid flows • Source code, documentation, and deployment support until the apps are live If you can architect, design, and code this end-to-end solution, let’s discuss your approach, timeline, and any clarifications you need.