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I have seen people requested on the spot to join a meeting interview where the candidate is already on the room.
Such kinds of interviews of course exist, but they often rather serve the purpose of chatting so that one can see whether the candidate gets on well with the future colleagues.
"Improvised" programming interviews are, of course, often a bad idea, but nevertheless these may also serve a purpose: do some more open-ended discussions about programming topics the candidate likes so that the colleagues/company can see whether they would profit from this kind of knowledge.
Such kinds of interviews of course exist, but they often rather serve the purpose of chatting so that one can see whether the candidate gets on well with the future colleagues.
"Improvised" programming interviews are, of course, often a bad idea, but nevertheless these may also serve a purpose: do some more open-ended discussions about programming topics the candidate likes so that the colleagues/company can see whether they would profit from this kind of knowledge.