Design and integrate a sales page on our website

We are looking for a website developer who can design and integrate a sales page to our existing website as well as be responsible for the long-term maintenance of it. The sales pages should contain a customer accounts area where clients can create an account, view our products and prices and place orders. We will be integrating Salesforce into the page once it is completed and therefore the work needs to be compatible. Design wise we are hoping to correlate it to our existing web design, so for reference you can look at our website LXD UK.