A mobile app for a unique concept social media startup

I am in need of a mobile app designed and developed for a unique concept social media network startup. The app should be developed for both iOS and Android platforms, offering users with registration & login features, profile creation, content sharing capability with audio, video, likes, share, comment and other features. Additionally, I am looking for a freelancer to provide design options based on the concept to ensure a world-class user experience. This project will require a top-level developer, who is experienced in both design and development to create a cutting-edge user experience.