We typically hire UGAs with previous experience, but new candidates are welcome to apply for a summer position. You can apply simply by checking the box for Summer on the UGA Application form.
The UGA position is somewhat different in the summer. Each UGA covers an entire building or several floors rather than just one floor, so you will have more residents to work with. The job requirements and duties are somewhat different as well due to the nature of the summer term, but will be discussed when hired.