Something like this?http://btcworker.com/
Or even this...http://www.forbitcoin.com/
oh and there is this....http://www.bitcoinjobs.com/
Note: I'd suggest you'd come up with a better idea.
But if that is really what you want to then you need to talk some details...
How much are you offering to make the system?
How much knowledge do you have of similar technologies (web sites / bitcoin api etc ) (just to gauge how difficult of a customer you would be)
Do you have a solid idea of how you think your site should look and behave?
If not I suggest you start diagramming how the site would work. (Do users have profiles, feedback etc... )
If you are serious about getting this made I am currently looking for work and I have a strong itch to code something bitcoin related but haven't had any ideas of my own yet.
actually it is not like any of those sites at all.
I pretty much just need the system made, I can manage front end design pretty easily. I am good experience with sites and bitcoin although I am not skilled enough to set up this site.
Also I know exactly how I want the site to behave and a good idea for how I want it to look.