Function Hall Android Application Using FireBase

I’m looking to develop an Android application for a Function Hall, which will utilize Firebase. The main feature will be ‘Schedule Booking’, with some basic functionalities including user registration and payment gateway (no need to integrate any third-party services for this). I have design specifications for the app, as well as ideas of how I want the features to work. I’d like to find a qualified freelancer who could turn my idea into reality, so I can start using the app.