Design an App UI for our Student Platform

We are creating an online space for university student in the form of an App. we need a mockup of the app designed that we can use for promotional tools as well as a framework for our developers to code off. The project will be launched on android and iOS so your design should be device agnostic. The existing mockup can be seen at [login to view URL] that can be used as a guide. The core functionality at this stage that will require UI Design include: * Users home page (4 equal sized buttons with icons [Books | Accommodation | Events | Work]) * Listing page (think similar to ebay/gumtree app listings) with thumbnail image, item title, key meta info and price* * Individual Page (think Gumtree) Product title, image, meta info, description and contact options (phone/email) * User signup page with facebook login button * Settings page with on/off toggles for options Please quote for creating the design for the 5 pages above and include examples of previous work.