Developer For Accounting Web App Using QuickBooks Online (QBO)

I am looking to build a full web app which will analyze data from QuickBooks Online. The application will utilize a portal experience to analyze multiple QuickBooks Online companies for each authenticated user. The application will need to authorize via QuickBooks Accountant (different than a standard user). We already have a talented developer which has a lot of the backend workflows built using Python and the front end developer will need to interface with them to complete this project. The website will need to be designed and built from scratch, which is a combination of a landing page, authentication and then the portal pages.

Only developers with experience utilizing QuickBooks Accountant workflows will be considered.