I will design UI screens for ANDROID and IOS apps.
Honestly speaking, I have 3 years of experience in apps UI designing. Any one know that nowadays smartphone industry is expending more and more. I don't think there is any country that don't have smart phone users (Android / IOS). There are billions of apps on Google Play store or Apple app store and this is interesting, more than that people are using smartphones.
No matter how perfect your app is according to programming. But if your app does not have good looking user friendly design then you are wasting your money and time.
First pay attention to your app design then the development part.
I will design clean and attractive android / ios app screens in Photoshop.