Graphic Designer for \Mobile App User InterfacePhone

We need a freelance front end developer/designer to re-skin a phone gap app for iOS and Android. Whilst it is a freelance one off, we are looking for someone reliable who can work on an ongoing basis as we will need ongoing front end support. 1. Experienced designing for adaptive mobile apps 2. Has experience designing clean minimalist user interfaces 3. Has a portfolio of work containing iOS/\Android app interfaces that have a minimalist/clean look and feel. 4. Experienced with designing for PhoneGap apps 5. Can read and write CSS/HTML 6. Can produce a graphic design in CSS/HTML 1, 2, and 3 are essential. 4, 5, and 6 are desirable. £250 for the entire project.