Zynga interview questions

Applied via career service of my college. Got an on campus interview. The interviewer asked very practical coding question which I didn't prepare for it. Got rejected in a week

I submitted my resume last semester on our school's job website. Then I got selected into the on campus interview a few weeks later. The interviewer seemed very concerned about my Mechanical Engineering background and asked a lot about my resume. I felt not happy when he even did not give a chance for a test.