Website Needs Drupal Expert

I have an online advertising platform that looks similar to buysellads.com. Users can buy and sell ads using the system. It was done in Drupal and php. However the previous programmer had some problems and wasn't able to finish it. It is at the final stages. It will be a challenging project as the system is complicated but it will make a good portfolio for your company/yourself. Need an experienced programmer to fix about 10 bugs and see it through the final stages. Only experienced programmers with Drupal and good ratings may bid. Kindly show some sample Drupal sites if interested.