eCommerce/User log-in Website design

Hello, I am interested in having a website designed that incorporates the following. Explains my business and my products eCommerce store that list my products for purchase. I only have one product which has different options Zencart, Shopify or similar could be used but must be modified User login for back-end interface (back-end interface has been done) Build database for user interface The qualifying applicant MUST be able to do the following Work independently Take instruction on a limited bases and improve on product or ideas Write content that is original, or taken from other sources and modified My project will not only see my product but will need to have a user interface that will work with a server and use API. What I am talking about is a Raspberry Pi that controls door locks and various other Zwave compatible items. The Pi has a small server on it generating door codes that it will send to the key pad Zwave controlled door. The user will log into the web site and interface with the server to generate a code for a specific period. This application is for condominium rentals. The API code is almost complete and what I need is the front end web page. This is a easy job. Don't make it hard. I can provide examples upon request. Let me know you thoughts Hobs