Most members of the guild are self-employed, taking on whatever jobs suit them at whatever time they like and only being paid for what they do. This list is for the few permanent positions in the guild - receptionists, members of the rescue team and doctors. Other positions might be added as they become necessary/I think of them.
The jobs listed here are not the only ones available! Mostly they're here to give people something to plot around. Feel free to handwave other jobs for your characters, within reason!