Amazon Software Development Manager interview questions

who was your best hire, how did you help him perform and grow. who was your worst hire and how do you handle low performers, tell me about a time when there is conflict in decision making and how did you manage, tell me you worst mistake/blunder and what did you learn, tell me how do you make sure the deliverables are of the right quality what metrics will you track. Finally lets design a system like Netflix/Amazon Instant Video. first few questions took 30 mins and the netflix design question took about 25 mins. last 5 mins was me asking questions to him about amazon

How to improve performance of webserver?