Fix and Complete Partially Built Logistics/Inventory App

I am looking for an experienced app developer to help finish and improve my app, Next Logistics. The app is already partially built using Rork and is close to what I need, but there are a few important features that need to be fixed and completed... (Budget: $250 - $750 USD, Jobs: Android, App Development, Backend Development, Excel, Inventory Management, Logistics, Mobile App Development, PHP)