Hello,
I have reviewed your requirement completely.
First of all I would like to mention that i'll do best website design for you.
You can see my design samples here:
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I'll also develop features so that seller can upload data online.
Lets discuss in details.
I have 7 Years development experience into web based applications.
I have exposure on technologies such as PHP, ROR, MySql, Jquery, JavaScript, Ajax, HTML & CSS.
I assure you 100% satisfaction.
Websites that I have developed::
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Thanks