There were 3 rounds . First round - Tell me about yourself and some questions regarding my current role and past projects. Then fundamental of OS and C like deadlocks, IPC mechanism, threads, shared memory, structured padding, malloc vs calloc, wild pointer, segmentation, paging vs swapping, friend class etc. Then interviewer asked to wait for 5 mins in the call for the next round Second round - Again introduction then asked few OS basic and then asked to write code for synchronization of 2 threads in C After this last round happened which was taken by manager: He asked about past experiences and explained in brief about the role for which they are hiring. He asked if you have thought or done any innovative project. Even though my technical went very well, I think the manager was not very happy with my answers so I didn't get offer :)