Ebay auction manager Joomla extension

I'd like a Joomla extension created enabling me upload, create and manage my eBay listings from my Joomla website. I imagine that familiarity with ebay api and Joomla source code would be necessary. A good example of what I'm after in terms of functionality is the site: [login to view URL] Though I believe i would require fewer features. ## Deliverables Any advice or suggestions would be welcomed