Hello,
I notice that you need an experienced developer with good knowledge in xamarin. I can assist you with that.
I'm having 3+ years of experience with Xamarin. Also, familiar with Firebase database and storage APIs, ASP. net, HTML, Css, REST Api.
I can also share my work with you, if you want to have a look at it please let me know.
I would be definitely able to incorporate the expected changes.
Let's discuss your needs. Looking forward to hear from you.
Cheers.