Hey
I hope you are doing well, I am sure about your thoughts and about your requirements in term of quality you are searching for, and I am sure that you are searching for a developer that writes clean code; I can guarantee that you are with the right person I write a clean, maintainable and testable code, and I will be thrilled to share with you some of my source codes to emphasize what I am talking about.
I in my work, I follow the MVVM architecture. I have an excellent understanding of this pattern, and I can work your whole project following it; it makes the project's code clean sustainable, and you can add features to your app in the future very easily.
I also have a strong knowledge of many aspects of the android development world (dealing with APIs, Room Database, Navigation, Caching, Reactive Programming, etc.), including new technologies and toolkits. I am pretty sure that the workflow will be as you think and best.
"AND YOU MUST MUST KNOW HOW TO IMPLEMENT IN-APP PURCHASES ON THE GOOGLE STORE." I already implemented the In-app purchases using etheir Java or Kotlin and I can deal with it easily (you can check one of my projects in my portfolio).
"PLEASE SEE ATTACHED DOCUMENT" I think you forgot to attach the file, I am ready to read it if you send it in private message.
I would be very happy to hear back from you, And I am ready to all kind of test or evaluation even discussion about my code.
Best regards