1st round will be with HR, they will ask some basic questions, basically, it's a screening. 2nd round will be a written paper. There will be three sections in the written test, written communication, aptitude& reasoning, and technical knowledge. 3rd Round will be with the line manager or AM they will check your analytical skills, communication, process knowledge, stability, and thought process. You just need to be confident with all your answers. 4th round will be Ops, you will meet with the operation manager. They will ask the same question which you have already answered in 1st & 3rd round. If you get selected you will be referred to the HR manager. He will inform you about the job responsibility and policies, you can negotiate the salary in this interaction

It was not easy. It went for around 53 minutes. The interviewer was really friendly. He started with basic introductory question and that the level of hardness got increased for the question. Although I didnt get selected, I learnt alot.