Android app - Identica Public Cloud (create Identica account)

I would like to hire an Android developer to create the first phase of our new App. We operate a public cloud service (Identica Public Cloud), which needs a mechanism to create user accounts and to make it possible to login to this accounts with the credentials created. We need an Android app, with only a very simple introduction page and a "create account" and "login" functionality. When the user creates his accounts, the App calls a [login to view URL] on our to be developed back-end, which saves the credentials to our SQL Server database. The App functionality should invoke ASP.Net or WebAPI methods to actually create the account and send out a confirmation e-mail that should be validated by the user. Once the user clicks on the link in the recieved e-mail, the account becomes ready to use. After that, the user is able to perform the "log on" on the App, which only should show a simple welcome page. So you will be entitled to use the best method to create this simple App with this very basic functionality. I require this to be created with Xamarin on Visual Studio, and we also need the source code to be handed over. We expect quality coding with comments and following good development practices. Furthermore, we would appreciate if you can take care of registering the App on the Google Play store (we pay the fees of course), when the App is ready. We will supply you a VDI to develop in, so you do not need to use your own PC and also no software; this will be supplied on the VDI. Please make your questions. Thanks for applying...