Wordpress developer/designer

I've got a wordpress marketplace site that needs a designers touch and some additional functionality added. I need someone with a strong design eye and a solid portfolio. I need someone that can mock-up something in Powerpoint and then apply the new layouts to the site. I also need someone that is comfortable custom coding plugin's, working with API's, and customizing themes.

I'm looking for someone to start full time and then do part time work as necessary after the site launches. I'll pay $10/hour during full-time employment, and then $12/hour after the site launches. I'm flexible on the rate for a truly talented wordpress guru. You'll also be required to use 'up-work' to track your working time and get paid.