Qualcomm

The interview was for a software engineer, but seeing "ECE" on my resume, he became completely uninterested. He started asking questions regarding communications, of which I had no idea. He asked a few very basic coding questions. It was clear he had

Mostly focusing on C, OS, and Data Structures (DS), especially arrays. That's not more than that. System knowledge is essential. Knowing the kernel helps. Check any Qualcomm interview questions; they tend to repeat the same topics.

First round is Written Test and the second round was Face to Face with Tech Team. Be prepared with Java concepts and the questions were based on the position requirement & what you have mentioned in your resume.