First, there was a coding round that consisted of two coding questions and 38 aptitude and basic computer science fundamental questions. After shortlisting, it had a total of 4 rounds of interviews, and it took the whole day.

They focused on core computer science subjects, including:

• Interrupt service routines
• Deadlocks (asked to code them)
• Semaphores
• Scheduling in operating systems

They also covered computer networks, such as:

• The role of all layers
• TCP
• UDP

I was asked if I was comfortable with UNIX/LINUX.

There were a few coding questions, like swapping the bits at two given positions.

Additionally, they asked about how recursion happens, the flow of a recursive program, and tree traversals.