The front-end developer is the bridge connecting the designer and the back-end developer. The develoer's work is to take the final designs of an application from the designer, and code it into the front-end code so the backend developer can understand it and build functionality of that app around it.
RPG and CLE
About RPG and CLE as well as going into the use of the older languages. The IBM S/36 code goes all the way back to the 1980's and even before that. Which comes about today as ILE