UX/UI Design for an iPhone application

We are looking for a UI/UX designer for an exciting project, creating a social media application and website with location based services, mapping directions, pinpoints, custom locations and advanced searching based on user criteria. Login through registration or social media accounts (such as Facebook). The general functionality will be somewhat similar to tour guide apps such as split guide, trip wolf and around me, however will also include a booking and payment mechanism. The mobile application will start out on the iOS platform and will be ported to Android and Windows phone. The website will be need to be a responsive design that is aesthetically pleasing, easy to navigate with a clean and dynamic interface, yet having the creative trademarks of a friendly and bubbly social media platform. There will also be a need for a mobile and tablet versions of the website. The website will have expanded content and functionality that will not exist in the app such as advanced account management tools. The app and the website will have different types of users, who will have different functions of the app and website available to them. This website and app will serve the general public who will search and book services, but there will be a more advanced interface for service providers to manage bookings and sell their services through the app and website.