There were 3 rounds in the interview process of this company. Technical round was first, they asked me questions on trees and arrays. System design round was next, I was asked to design random number generator. Hiring manager round HR round

It was a hiring drive, I had applied through a consultancy. I was given an aptitude test, to which I scoffed at in the beginning. After the test I was given a coding question . Then I had 3 F2F rounds. In the first round there were 2 coding questions and my approach to the earlier question was discussed. In the second round I was asked a system design question as well as a coding question. The third round was with the Engineering Lead and he discussed a problem which they were solving at scale. He asked me how I would tackle that problem. Then the HR discussed salary and other things with me. All these rounds took place in a day and I was quite exhausted by the end. Also they had provided snacks during the day.