I applied online. The process took 3 weeks. I interviewed at Qualcomm (Austin, TX) in Feb 2016
Interview
The process included one HR and one technical phone interview. A principal engineer of the LLVM team conducted my HR interview, who asked me about my background in compilers and security. I had to follow-up with the interviewer to schedule my technical interview. The technical interviewer asked questions regarding security and discussed a part of code sent to me just before the interview.
Interview questions [1]
Question 1
Describing few well-known security vulnerabilities
Had to find the bugs present in the code