Hi,
I am an experenced UI/UX designer. I have created many complex and heavy GUIs. And would like to design a GUI for you too. You may provide the purpose of your App, so that I can create appropriate design.
Just contact me, I will provide a sample for your UI before you hire me.
Trust me and leave your project to me. And rise me up on this site.
I shall be very thankful to you,
Ishaq