To farm jobs repeatedly (even after the latest title update), hit Like on the mission after completing it and have everyone in the game hit RT (360) or R2 (PS3). The words Restart will appear in the final column befroe the mission begins again. Players can do this infinitely, getting money and RP each time. This works better with Jobs that can be repeated quickly, such as Violent Duct Job. Note that if you exit the mission entirely, you may be locked out of it for a duration of time, preventing you from restarting it. Make sure to only quit out of the mission after you are satisfied with the money you have made thus far.