How Spree handles overriding on the frontend and the backend

A couple months ago, after signing a contract to build an unusual e-commerce site, we were forced to make a choice. We’d build the site either from scratch or on top of existing solutions. After a few days of getting our heads around the topic, we decided to take on the latter option. Since we cherish Ruby, we chose the most popular Ruby based e-commerce engine: Spree.