I’m interested in the position of "Build a Website" you recently posted. I have been working as a (Frontend Developer ) for (5) years, and am very familiar with HTML5, CSS3, jQuery, JavaScript, Twitter Bootstrap, Php, WordPress and Adobe Photoshop.
Yes you can purchase freelancer clone to make website same as Freelancer. I can help you with building site same as freelancer. That should be PHP script. And yes there is WordPress theme too for this purpose.