Building OpenCart website with specific requirements

we need good quality OpenCart website developers with following features:
+ synchronise product information with amazon and ebay
+ mailchimp
+ online chat

+ quantity box in product list page
+ minimum order (batch add to cart)
+ notification button if out of stock
+ 1 page checkout
+ download previous orders (excel/ pdf)
+ popup advertisement on homepage

+ order status with different colour self defined


******* Need to send us your current samples *******