Jimmy was a security guard for the Southwest Aniline chemical plant.
Season 1 (Breaking Bad)
Jimmy was radioed by his colleague Billy to let Jimmy know that Billy was taking a break to use the restroom. Jimmy sarcastically wished Billy luck. After the warehouse alarm sounded when Walter White and Jesse Pinkman stole a barrel of methylamine, Jimmy tried radioing Billy to ask him to check out the disturbance, but Billy was blocked from leaving the porta-john thanks to Walt and Jesse tying a cable around the stall. As Jimmy fruitlessly radioed Billy, Walt and Jesse made a hasty retreat ("A No-Rough-Stuff-Type Deal").