Two 45 minute - 1 hour interviews with Qualcomm engineers. My first interview was over the phone and I was mainly asked about basic C programming concepts (how programs are run, stack/heap memory, program structure, etc.). Second interview was through Microsoft teams and was more technical. I was asked a string and linked list question and then went through personal projects on my resume. Two weeks later, I received an offer. I would say study LC easy/medium questions (arrays, linked lists, strings) and review data structures & algorithms concepts.