Very informal. You usually arent dealing with Amazon level PR but rather a manager or owner that needs a spot filled. If you get an interview generally you are already hired. Depends on the store completely. I applied and was called in. Talked with the store manager about past experience. Pretty straight forward and was handed a uniform and hat on my way out the door with a schedule of my first few shifts on a piece of paper. They had lost 3 staff that month.