Amazon Developer interview questions

A couple of technical questions such as how to make hash tables more efficient, if we have a reference string and an array of strings how do we find out which string in the array contains the same letters as the sources string in an efficient manner.

Submitted resume and got an HR call-back. Chatted with HR a bit about the company and then schedule for a phone screen. first phone screen was approx 45 minutes long with programming question and algorithm questions. I screw up as I haven't prepared for the aged stuffs. Read and review your data structure books and programming books. Algorithm review is useful too. Overall the phone interviewer was nice and friendly.