Because I'm a professional when it comes to:
-Server APIs, SQLite, Realm Databases.
-THE GPS. Camera API, location
-image catching, processing, caching, displaying, gallery, wallpaper apps
-user interaction
-integration with push notification
-I also utilize Google Material Design
I can build any kind of App for you.. please provide me sketches, documents or a link to sample app on the Play Store and I will get back to you