Had this already 3 times that interviewers ask me out about their Engineering problems, and how I would solve them. Initially I got good or very good feedback but then afterwards was rejected. It feels weird, also if I consider that they might do this with every person interviewed. Crowdsourcing knowledge through interviews, yay ;)
Seems far more appropriate to get toy problems, if that is needed at all, or to get scoped problems but then get reimbursed if it takes several hours.
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