Ask about the job.

You point out the sign to Grillby and ask if he is still looking for someone to hire. Grillby looks between you and the sign for a moment, then walks through the fire door. Since no alarms go off, you assume that fire door is meant for him, and wait at the bar for a bit. There isn't much else to do with the bartender gone, aside from watching the other patrons. There's not that many, sequestered in groups of ones or twos, either taking sips of their drinks or chatting with one another. Eventually, Grillby comes back with a pen and a piece of paper. Grillby sets down the two objects in front of you and then crosses his arms as he waits nearby. The piece of paper, as it turns out, is a job application. It isn't a very long job application, so you make sure to take the time and actually read it before signing anything for once.

From what you're reading on the application, you'll be paid 200 G for just a few hours of work, but the hours are extremely flexible. So flexible, in fact, that you could basically work whenever you feel like it. As long as you show up every now and then, you don't even need to go to the pub every day. Just before you take the pen and sign, you start to wonder how you might convince Grillby to make this deal even better.