Single admin for multiple website needed in WordPress

We need a developer who can write codes/programs to fulfill below tasks. 1. The codes should be done in such as way it can handle multiple sites with one ADMIN SECTION , for example say we have 10 sites. 1 master & 10 affiliates, [login to view URL] [login to view URL] [login to view URL] . . . [login to view URL] Now we need the customer area for all the sites. But the Admin section should be ONE ( [login to view URL]). We should be able to Add pages, add products, See all product list, See all registered users list, see all sales made ( with affiliate sites name) on all the sites from one admin. 2. Customer area with log in, registration, Download, Wishlist, profile ( name, add, etc) 3. Auto emails for registration, password recovery, adding products to wishlist, making purchase, & product download. A. We have our digital products in a MediaFire account, buyers should be able to download the file he paid for ( there are many files/products). B. Download should be done without exposing the permanent link/location of the files. A limit of 2 downloads per products apply.