"vacant job" is correct and usable in written English.
You can use it to refer to any job that is currently available or unfilled. For example, "I am looking for a vacant job in the medical field."
The Recife side have offered Mourinho their vacant job and put together quite a tempting offer.
It was unclear who would replace him, or how the vacant job would be defined.
Yet, there are indications that the vacant job — though lacking in outward glamour — might be an unexpectedly enviable one.
Therefore every time a pusher is arrested a crowd of qualified applicants scramble for the vacant job.
It was also his first showing since the news that Mr. Simons was the latest candidate called in to talk about the vacant job at Dior.
Di Matteo was interviewed for the vacant job at Birmingham City recently but was overlooked for former Newcastle United manager Chris Hughton.
ESPN will not fill 200 vacant jobs.
About 300 jobs would be eliminated through retirements, voluntary departures and elimination of vacant jobs.
The N.B.A. shed a tenth of its staff, and ESPN will not fill 200 vacant jobs.
Staffing levels fell largely through attrition, or not filling vacant jobs after employees left, the company said.
What was then West Germany needed their labor, because some of its industries had trouble filling vacant jobs.
