Job Database (with Design in 2nd step)

I need something like a tiny version of freelancer.com. Which means a Wordpress based database, where users can open projects, accept projects and finish projects. In the first step I want to set up the functionality – there’s no web design needed. The webdesign will be started after testing of all the functionality. I would prefer someone for this project who is able to build up the website >and< do the web design afterwards. I’ve already tested some smaller things on my webpage [login to view URL] like the installation of several Wordpress plugins. Maybe this site could also be programmed in Drupal... but I prefer Wordpress - unless someone will convince me using Drupal... ;-)