Need a webapp for ebay and amazon experienced programmers only

We need a web application as under The application will work like this The XML feed to tool will be like website will be like this [login to view URL] So basic functions will be 1.a. Create option and code to get XML feed form an ecomm site to tool b. Create a tool for eBay and Amazon import seperately - Create/update/delete product in eBay and Amazon - Check Sale Order in eBay and Amazon - Manage stock with eBay and Amazon - Track all records in tool's database table 2. Design for the Tool - Template is given - Display All Graphs (Use graphs in template to make dashboard and record number of sales each day.) 3. Once product is sold in ebay a reverse feed will update stock in toll and tool will update stock in parent site where that product belongs too we would like to use [login to view URL] as application template. If you guys done something like that earlier please send examples too Max budget is around 400 to 500$ Payment terms will be we will start with a 10% starting milestone 10% will be added to milestone when import of XML feed form ecomm site will be completed. 10% will be added when we see features of editing of stock and products are are available in application 20% will be added when we see products get posted on ebay 20% will be added when we see products stock gets updated in tool and sales graphs starts working 20% will be added when we see product stock gets updated in parent website form which initial data feed came 20% will be added when we test every thing and found all in wokring All milestones will be released when it it is successfully hosted and tested.