Exposure from backlinks for job posting URL. Will soon expire, how best to keep the backlink juice?

[MartinAndrew]

Hi All,

First post and apologies if this seems obvious.

I run a niche jobs board and recently one of our openings was shared online quite heavily after a press release.  The exposure has been great but my problem is the URL generated for the job post will soon expire.

I was wondering the best way to keep the "link juice"  as I can't extend the post indefinitely as the job has been filled. Would a 301 redirect work best in this case?

Thanks in advance for the info!