There were a total of 6 rounds.

1st Round: Telephonic. It took approximately 45 minutes.

After that, they called for an F2F interview.

2nd Round: Technical Interview 3rd Round: Technical Interview 4th Round: Technical Interview 5th Round: Ops Manager 6th Round: HR

They were all pretty straightforward, and the interviewers were friendly. They asked mostly about C, bitwise operator implementations, data structures, memory management, etc. All the interviewers asked me about my projects in detail (not only the recent one, they asked about all).

Pointers, array of pointers, function to pointers usage and syntax. WAP to toggle alternate bits of a given number. Volatile variable implementation. WAP to reverse a linked list. WAP to check if it's little endian or big endian. WAP to count how many bits of a given number are set. WAP to push and pop in a stack using a linked list. WAP to sort a linked list. How a system boots up? How paging works? OPs manager mainly asks about projects, challenges faced, what role I am looking for, etc. HR round.