Build an App Item Manager for Destiny 2

I am seeing to build an application that supports the Destiny 2 Gaming community. Please note that this is NOT a video game or a gaming app, this is an inventory, item manager. We will need to enable Build specific features into this app as a key differentiator, which we can discuss if you are interested in the project. App will pull everything from the [login to view URL] API which has many existing GITs and well-documented APIs. For your reference I've placed some applications below that is an example of the type of application commonly on the market. I have a key differentiation to share that I can only share with NDA and a detailed document. I am a fan of FLUTTER, would like to leverage due to platform portability and ease of use. Open to suggestions. Please share previous work/relevant projects you have done similar to what I have described to help me make a decision. Thank you! Happy to discuss and solicit bids. An Example of this type of application is below: EXAMPLE 1: [login to view URL] AND EXAMPLE 2: [login to view URL]