So I work in a field in which the main position is VERY difficult to find good pools of people for your main position. There are just so many licensed funeral directors in the state, only so many of those don't work for family businesses, only so many of those are looking for a new job, and only so many of those are quality people. So I can have a job opening for 2-3 months, and literally only receive 3-4 applications.
With all that said, I have one candidate who I would have otherwise probably hired after his first time in, but he volunteered during the interview process all his various health ailments over the years. While I appreciate his honesty, I couldn't help but hear what he was saying and process this as "well, it looks like this guy will be prone to regular prolonged absences from work over the next few years". I realize that's probably not great on me as a person, but it's what I was thinking from the logistical end.
I'm circling back to the guy now and interviewing him again on Friday, as frankly I've come around to just wanting a quality person in at this point and am tired of being short-staffed, but it would have been beneficial for him had he not offered up that information he did not need to and that I wouldn't ask him about. So that's one direct example of advice from me.
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On a more general front, personally I wish candidates would come in ready to ask more questions. Asking about our operations or the job details helps us both get a better understanding of where we are, and makes the interview process a bit more personable and a little less like a one way grilling. It also shows genuine interest in the position and knowing what you're potentially signing up for.