i would say the experience is mixed, some people are quite nice and some are a bit hard to say. seem like the interviewer gave a stop at the last round after complete 1-4 rounds, seems like he has a difficult time understanding the design decision from a past project, even though the other part of the last round went pretty well. questions like how do you handle errors. not very good candidate experience, if a person did not like someone's experience or something, don't loop this person into the interview process. not at the end because you *feel* like this is some imaginary red flag. don't interview with this company.. they can waste you lots of time... then put it on your jd that you want 10 years of exp... very biased, you can have 20 years of exp, if you want someone with lot of years of exp, put it on the jd...