I have been a recruiter for over 2 years now. The main things that I don't like in candidates are overconfidence and dishonesty. Confidence is very important during an interview but overconfidence is very bad. And most of the candidates think that their lie is not noticed by the recruiters. Let me tell you that, we do realize that you are lying but we don't let you know that we know. I do that to see to what extent the candidate can lie up to. So, my suggestion is: Be confidence but don't be over confident. Be honest.