Qualcomm Validation Engineer interview questions

Interview was on Skype. It was 4 hours long interview. 3 Technical and 1 HR round. Never got positive or Negative results. I guess I was not selected. I followed up but did not get respond from HR as well.

They called for an interview at the company. there were 2 interviewers, they were very nice. At first each interviewer told a little about himself, how long he was at the company, and his role in the company and its background. Then ask technical questions