Before doing BDD, like you I was working on backend first. Since I experiment BDD, when I work on backend, I have switched my mind from "what could be useful ?"

Before doing BDD, like you I was working on backend first. Since I experiment BDD, when I work on backend, I have switched my mind from "what could be useful ?" to "what is really needed ?". Writing UI first helps me to find the answer. I am not sure that writing UI first is a common practice, but it fits good with development of web application which relies a lot on UI.