Mobile app for Android

I am looking for a mobile app developer to create an Android app with a social networking purpose. I already have a list of features that I would like the app to have and I have a rough idea about the designs, but I need them to be created from scratch. The app should be user friendly and optimized for mobile use. Furthermore, the app must be tested across different platforms to ensure proper functioning and everything should be developed in accordance with the security protocols of the platform.