Qualcomm interview questions

I applied online, got a phone interview, and then was offered a chance to interview in person. I live close to San Diego so I drove my own car in the night before. They paid for a hotel that was very close to where I was suppose to meet my HR rep. I met the HR rep at 11AM, she gave me an overview of the company. Then I drove my car to the next stage of the interview process (I was offered a shuttle, but I didn't want it). This is where the real interview began. I had lunch with a software engineer, we talked about the company and he had a few softball questions for me. The next three interviewers appeared to be software engineers chosen at random. (At least to me.) I meet with them one at a time. Some asked good questions, some were not so good at interviewing. It was all that standard stuff. Then I meet with the final interviewer. He was very experienced in interviewing and asked lots of very pointed questions. After it was over they said they'd get back to me in a week or two either way.

I was contacted by email to set up a phone interview. In the phone interview I was asked a lot of technical questions about C. But only basic stuff. And a case study to test an ATM machine. The interview lasted about 30-45 mins and later the interviewer explained to me the job profile and the responsibilities. Received a reject after about 2 weeks. They never specified the reason of reject.