The hr contacted me through LinkedIn. There are totally 4 rounds of interviews. First-round - Hacker earth programming test. Second round - Tech Hr with 3 medium programming questions, Java concepts that covered oops,threads,collections, exceptions, and basic SQL queries. Third round - Tech Hr with concepts on Spring, Hibernate, and SQL along with java concepts (medium questions) Final round - With the Hiring manager, Asked about design concepts using microservices for Ticket Booking App like BookMyShow. I had terrible internet issues on this round. The interviewer got irritated.