First, they had a written test which had 15 questions, including 3 programs and output questions. After that, there was an evaluation and discussion of the test. After being selected in this round, we waited 3-4 hours for the next round.

They asked to write three programs (array, semaphore, mutex) and asked OS and threads questions. After that, we waited for the next 2-3 hours for the next MR round. There were more candidates (C++ and Java) and only one senior manager, so suddenly one senior architect came and took my interview in a very rude manner. After half an hour, he said I was rejected.

It was just bad luck; if I would have gotten the chance to attend the MR round like others, the result would have been different. Overall, the drive was not properly planned and was unexpected.

Multithreading, IPC, and design.