I contacted my Google recruiter, who had been reaching out to me for several months.

I was invited to an onsite interview, which took approximately 6 hours in total. There were 5-6 sessions, each lasting about 45 minutes. I was asked to write code on the whiteboard. The questions were quite difficult and assessed my understanding of data structures, algorithmic problem-solving skills, communication skills, runtime analysis, system design, and programming languages. Overall, the interview questions were fair and tested my software engineering skill set.

Write code that does X, with a good error-handling mechanism, fast runtime, and good decomposition.