The phone interview consisted of questions about my past work experience.

Then I was called for an on-site interview. The interview lasted five hours, with thirty-minute interviews with ten people, including one with HR. Most of the questions were about my past experience as well.

It included a lot of drawing on the whiteboard to explain the architecture of software I had worked on. There were some programming questions, which were quite simple, such as:

• Code for the Fibonacci series and factorial using both recursive and non-recursive methods.
• Counting the number of 1s in a variable.
• Writing code for a circular buffer.

I also had questions on OS, like memory management, interrupt handling, and preemption.

I thought I did well, but I did not receive an offer.

Write code for writing to a circular buffer.

Write code for generating a factorial/Fibonacci for a given number using both recursive and non-recursive methods. Advantages and disadvantages of each method.