I am looking to build a site like [url removed, login to view] and Groupon.com. It would enable facebook login, sales of multiple products for a limited amount time, and also efficiently manage payment through a system like Amazon Payments for example. We need to include email preferences, email marketing if possible, and a dashboard for the sellers to view their product line's sales.
We are looking for a knowledgable development team with a focus on offering a great user experience. Platform is to be determined, and we are open to guidance on the approach we should take with respect to software.