Mockup/Redesign App Pages

Looking for a mockup artist to design a set of pages for an app going through a UI redesign. We are looking for an experienced designer preferably having experience in Google's Material Design (especially the new series that was released at Google IO). The app has a set of specifications that we think would be the best fit for the app, however, you can point out sections of the specifications that wouldn't really work or wouldn't be user friendly. The app is a food discovery and ordering in specified locations. We need designers that have experience creating designs simple enough to be used with a group of non tech savvy users, yet have an advanced section for more advanced users. The initial specifications has been uploaded. There will be around 15 app pages. We think this project should take around 1/2 - 1 week worth of hours