I read someone's post about how they joined a job and were completely warped into a gang attack. I checked the support site and there's a job issue on all platforms. The support site also mentions issues accessing SC content like stats, messages, and avatars.
6/4/14: We are investigating reports of players receiving errors when attempting to join a job, including "The Rockstar game services are unavailable right now. Please try again later. Return to GTA Online." Please stay tuned to this page for updates.
So if you've got problems, you'll need to sit tight.