This paper describes an e-commerce software prototype based on the services delivery model, Software as a Service -SAAS, provided by Cloud Computing. The prototype corresponds to the first version of a tool aimed at improving the competitive strength of SMEs, allowing: (a) transcend barriers of time and space and (b) compete against imports of foreign companies. The architecture of the tool is based on the pattern Model/View/Controller-MVC. The methodology used was SCRUM. The prototype supports features such as multi-store and product customization, features that have been little explored by applications and e-commerce platforms currently available.