Hi,
I am Shariq from USA.
Just read your project requirements and you're looking for someone who can develop an app using android / xamarin.
I can help you with android development, i can design and build the app using native android, i can also handle the database. Before we get started i need some more details about the app.
You can feel free to check my recent work which i did for my client.
Looking forward to hearing from you.
Thank you.