There was 1 technical phone screen and 4 rounds in virtual onsite. Each round focused on problem-solving alongside fundamentals in C and systems programming. There were low-level design questions as well.
Applied online. heard from recruiter and scheduled Interview with hiring manager. Asked about experience related to role and quick technical questions (required knowledge in the field). Whole thing was pretty fast turnaround.
It was fairly easy focus on os basics, easy dsa, bit operation and linked list. They will be helpful in case u get stuck, overall process is fairly easy. Best of luck