Custom App to view Shopify orders

Description

We have a business which sells balloons in a box. At the moment, we use order emails for picking and we've outgrown it - with a major issue being if a customer changes a desired delivery date or address.
We are looking to have an app built which fits our needs, using Shopify data and with the ability to update Shopify data within.
We are looking to sort by delivery date and pull through the order information, if a delivery address changes it pulls that through and shows us too. Full brief available on request but this is the outline. Happy to discuss budget.