Build a Website

We are a wholesale company that has just started a retail site. Currently we have two separate sites for each endeavor but we'd like to combine it into one. The general idea is that the homepage will let the customer choose between retail or wholesale. Our retail site is currently through Shopify and a seamless transition with our current products would be necessary. Our wholesale site is currently through Big Commerce. The big issue would be to transfer our users to any other server if necessary. There are no products on the Big Commerce site to migrate. However, we do use Big Commerce to host our email. We would also need any new server to offer a client login, and once that client login is entered the client can see content that is hidden from the general public. A background in jewelry/fashion web design is preferred. Please supply a portfolio of your work.