Recruiterflow gives you an option to assign a reason when you are disqualifying a candidate. You can select from a list of pre-defined reasons to assign disqualification reason.

You can add various disqualification reasons for your company.

Simply go to 'Job Settings' in your settings menu and you can add, delete and edit the reasons there.

Once you're done with your list, save it.
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It will then be available in your list of reasons when you are disqualifying a candidate.