Need an expert android developer to fix some issues in a android project

I need an expert from India only who is good in NDK can fix some issues in a project. The issues are like below. 1. Hanging problem( It Hangs some time on some of the devices) 2. Little enhance in UI ( Like adjustment of positions and size of the buttons) 3. In the app there is an option to select photos. This will in folder wise just like in whatsapp messenger where you can select photos from camera/download/ screenshoot etc. Two more issues are there. All these things will be discussed privately..