Amazon Software Engineer interview questions

Interviewed for Amazon for 3 different positions. Each time, the interviewers we're unorganized and scrambling to find out where to go next. Quite possibly the worst interviews I've experiences

I appeared for a codesprint at interviewstreet.com for Amazon India. I could solve 4 out 4 problems. I was given two emails to send my resume to. One of them bounced and from the other I got no response. On reminder, I got out of office reply. I asked the manager mentioned in the out of office reply for updates. There was no response from him either. This process took a month. I demanded an explanation about this behavior from interviewstreet. Immediately they swung into action and the manager from Amazon replied saying that I should receive a call from HR. I got a call from Chennai HR, saying that the Bangalore HR will be call me up and schedule an interview. No response for the next 7 days, suddenly another HR person wakes up and contacts interviewstreet saying that he missed the email. I reply saying that I had been called by a HR personnel who has informed me that an interview will be scheduled with Bangalore team. More than a month no communication from Amazon side - not even a email saying that my experience does not seem to be relevant, or looks inadequate or that they have no more requirements as of now. Just to put things in perspective, I hold MTech degree in CSE from IIT and have 4 years of experience in the industry. Overall, my experience about the interview process has been not just negative but disappointing. I was interested in Amazon, as they do some work in interesting topics like machine learning, NLP etc but with this experience, I would never like to work with them.