I have a script already which works 90% - i need someone who can fill in the holes and possibly add to it.
the script i have is by cogzidel - RBS (reverse bidding script) 1.6 rc6
if you look for it on google you will find a demo.
I can provide a list of the bugs the site has, and would like someone with enough skill to make sure the code is secure.
the script is open source so you can download to test and work with then send on to me, or i can provide a dev site for you.