I applied through an employee referral. The process took 4+ weeks. I interviewed at Volta Resources (Rosemead, CA) in May 2011.
There was a phone interview and there were questions based on the general job duties that I could perform and also very high level knowledge about the specific area of interest. After the phone interview, I got a positive response saying that there would be a personal interview at the office location. It was scheduled after 10days and there were all kinds of questions. After that within 20days I was offered a job.
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