I know how to make ExpressionEngine do whatever you want it to do. I can design custom backend interfaces for EE that are tailored to your specific needs. I also know CartThrob (the best shopping cart module for EE). I can create a custom interface for managing orders, inventory, customers, or whatever you may need.
I also know PHP and CodeIgniter and can design custom Plugins for EE if necessary. I understand good UI design and believe in adaptive layouts. My interfaces will work just as good on your iPhone as they will on your desktop.