Develop a B2B responsive website

We are looking to build a B2B webshop which will list our catalogues and where our customers and agents can use to place order anywhere on any device. Our requirements are as follows. Front end * Full responsive on ANY DEVICE! * Catalogue only visible after logging in. Without logging in you see nothing. * The website supports multiple languages. So pre translated front ends. * First you see a page where you can select the categorie by pressing on the image of the categorie. For instance if you want to select a phone you select first the brand. * The second level shows the product within this categorie. You see the title below the product image and below that you can select the quantity. * The quanitity is put as 0. By pressing the plus or minus sign you can add or substract the quantity. So on the left side you have the minus sign and on the right side you have the plus sign. In between you have the quantity. This quanitity can be per 1 or per bundle. But for customer it should as easy as possible to add quanitity for the items they need. * Then they can move to the second product by scrolling down and adding more quantities to other items that they need. * Once they finish with this categorie they select the add to cart button and all the items and the quanities are added to the cart. * After this they can go back to the categorie page and select the other categorie from which they want to order. * After the order is finished they can go to the cart and all their shipping information should be pre filled and they just select send and the order is saved as order for us. * The customer can track their order with status change which we will take care on the back end. Back end * Multiple users with user rights. So a product categorie person cannot edit orders etc. * Able to export and import customers data, order data, product data in csv or excel format. All the existing data can be updated through csv or excel like the prices, inventory levels product titles etc. * Each order dan be edited manually. * New order can be imported through CSV format. * Customer can be emailed through the back end with status updates. Please show us work that you have already done for B2B existing website and if possible provide references.