Hello. How are you?
I have already build many apps like app you want.
I have experience with Sms , and Push , Spy app, Guard patrol and School management system based on Nfc Read/Write , Driver & Taxi app on GPS, Routing app based on GoogleMp,Youtubevideo, JNI(FFMPEG,OPENVPN) , Responsible mobile site
Bank Management system, Driver Routing app and so on.