Hi!
I can integrate ads in your android and ios apps , i have already integrated admob , ad colony and other companies add, simply send me your code and banner , interstial and app ids so i can integrate and yes i have already read different sizes of your ads requirements
I'm a mobile application developer with years of experience working on Android & iOS.
Its starting of my profile i will give 100%, looking forward to working on this project with you.
Best regards,
Mohammad Abdullah