First Round: Online Assessment, some aptitude questions, not that tough, mental ability type questions, MCQs on programming concepts like OOPS, OS and all, some on data structures too, like time complexity, number of iterations on the following code. Some English proficiency questions as well, fairly easy. Finally, in the last section: 2 programming questions, totally based on data structures, a naive approach would work (I avoided the naive solution, but one of my friends tried brute force and did pass all the test cases). Second Round: HR round, just a formal talk with HR, they asked about future plans, may ask personal questions. Overall a nice conversation, wasn't an elimination round in my case. Third Round: Technical Round, just intermediate level aptitude questions, and some mental ability ones, like we used to solve in olympiads (IMO/NCO). Some English proficiency questions as well. Overall, not tough, but yes, an elimination round. Final Round: CEO Round, they asked some questions about me, my family background etc. Then some DSA questions. He'd ask for the intuitive solution first, then, will ask you to optimize it. Optimization skills are checked here. Then got some clock aptitude questions, getting the correct answer isn't important, the thought process to approach the solution is. Overall, not very hard, if you don't panic.