I am looking for back end programming, (i.e. database, content management system, etc.) for a professional networking site. Programmer should be able to use existing templates and extensions from Joomla! or other cms.
Website functions include searching and bidding system similar to [login to view URL], escrow services, feedback functions, ability to create a provider profile like [login to view URL], project management application, billing/invoicing services, merchant account, and a form for individuals to post an RFP.
Want to keep it simple and efficient. I have attached a simple mindmap (download freemind to view) of the end users and what they need to be able to do on the site.