Trying to find an ecommerce solution for a website idea...The concept would be somewhat similar to Elance, Odesk, or other outsourcing sites:

1) A contractor signs up and creates a profile
2) A browser can find that contractor and hire them for a job through the site
3) The website handles the payment and keeps a commission for pairing the two

Any ideas on where to find an out of the box solution for this or a solution that would only need some smaller modifications?