The talent pool
Keep the good candidates you did not take, and call them back at the next opening.
The talent pool gathers the candidates you did not take this time, but whom you would gladly call back. It is in Team → Recruitment → Talent pool.
Add someone to the pool
From the candidate record, actions menu, Add to talent pool.
Consent is required. Only candidates who ticked "Keep my profile in the talent pool for future roles" when they applied can be added to it. Without that consent, the addition is refused with the message "Could not add (no consent, or already in the pool)".
You see the state of both consents on each candidate's record, and the Consent column of the Candidates list shows it too.
Find someone again
The pool list shows, for each person: the candidate, the job applied for, the spoken languages, the notes, who added them and when.
A search field lets you search by name, and the filters cover declared availability and spoken languages. The availability filter crosses a day with a moment of the day: ticking "Saturday" and "evening" together really does mean Saturday evening.
Call someone back for a new job
On the record of a person in the pool, click Attach to job, then choose a published job. An application is created for them on that job, with the source "Talent pool", and they appear on your stages board.
So you do not start from scratch: the candidate does not have to fill in the form again, and you do not have to hunt for their CV.
If attaching fails, it is usually because consent is missing or because the person already has an application under way for that job.
Remove someone from the pool
The Remove button takes them out of the pool. Their past applications are not affected.