Build Server, both Android and iOS

Me and my team are working on a product which supports both Android and iOS, and for different clients and differect devices we have different build settings. So we have spent few hour a day to manage building APPs for our client, and for testing even for very little changes.

Process: Client A, device1, Android coding -> setting -> build1 -> setting -> Android Studio -> build2 Client A, iOS coding -> setting -> build1 -> setting -> XCode -> build2

What we are planing to do is a daily build server, which - pull the commit code automatically - build setting for different platform (android, iOS) - build setting for different device (Samsung S6 or Android Pad) - build as xCode/android project - build to .ipa or .apk from the project

It is very annoying but we have no crew how to save few hours for the building process on everyday. I m very appreciated if you have any idea to improve any of these process