Someone who checks out the obituaries in the newspaper, looking for someone who recently died, who worked at a job that the job vulture wants. He then quickly sends in a resume, before the job opening is advertised, avoiding competition from other job-seekers.
Marlene: Wow, we got a resume for Bob's job, and he was just buried yesterday! We haven't even put out an ad yet!
Jan: Looks like a job vulture. I like his efficiency! Get him in here for an interview.