Online Supermarket Site

This job is for the design and coding of a new online supermarket. Tasks will include Website design, and the development of the custom ecommerce application. My preference is for ofbiz solution long term but I am open to idea's. There are 2 stages to the project. I want to get the initial store up and running as soon as possible. This may use a simple ecommerce solution which will be replaced in the longer term. Solution needs to deal with about 6000 items to start with and volumes of up to 10000 visitors per week. Stage 2 - There will then be ongoing customisation and improvements, coding of back office functions and ERP functionality. Will need to deal with 20,000+ items, and 400,000+ visitors per week. ? It is expected development would follow an agile method. Bidders need to show previous work for complex projects of this scale. Please refer the following sites to get an idea what is required. [login to view URL] [login to view URL] [login to view URL] [login to view URL] Key factors I am looking for are ability to deliver results quickly and a history of successful projects using technologies required projects.