Hello
I see that you have problem with your application background, I can help you with that, but firs I have to know what kind of database you have on your background. And how I see your database is damage so do you thinking about migrate to Firebase.
You can contact me to discuss about this things , from tomorrow I am free of work so I can start with your application. And good thing will be if you can send me source code to see what is your application about.
Best Regard
Victor