App for Live GPS tracking system

I'm looking for someone to create an app for a live GPS tracking system for both iOS and Android devices. While I have an idea of how I want the app to look, I need some assistance in developing a layout that is user-friendly and will meet all my needs. The main purpose of the app is to provide real-time tracking for users, as this is the most important feature for me. Graphics and design are important and I would like it to be as intuitive and eye-catching as possible. I'm looking for someone who can provide expertise in app development, design, and GPS tracking capabilities.