Got a call from the recruiter and had 2 technical rounds.
First round: https://leetcode.com/problems/string-to-integer-atoi/description/ , along with that some technical questions on my previous projects. Topics included debugging tools, sanitizers, segmentation faults (SEGV), and compilers.

Second round: Focused on multithreading, IPC, shell commands, and networking. I was also asked to implement strlen() in C.

Final verdict: Rejected.

Overall, the difficulty level was easy, but strong practical knowledge of networking was expected.