This is hourly job or real budget is 15 usd?
Anyway, let's discuss your job and budget.
As Prefessional individual senior an android app developer who can work in your timezone with 7 years of experiences, I'd like to help you.
I am very interested in your android project.
I have developed many android applications involving various functionalities
firebase, call/sms, processing of payment, MVVM and MVP struction, Bluetooth, Voice/Video recording, GPS/Geolocation, Google Map, Messaging&video Chat, Push notification, Bar&QR code scanning
Photo&Video edit App, JSON, Google&Facebook API, and many other implementations(native android-java&kotlin).
Love to work long term.
Looking forward to hearing from you.