I was referred by an employee. Recruiter contacted me and he scheduled a screening interview. After the screening round; a technical phone interview was scheduled with the Director of Engineering team. Technical Phone Interview - It was 30 minutes interview. He asked me questions on Java, Spring framework and the projects I had listed on my resume. I answered all the questions. He gave me an overview of what his team does. After the technical phone interview, I waited for a week but I did not get any update from the recruiter. I sent him a follow up email to the recruiter. He said they have closed the position I was interviewed for. However, the interviewer gave positive feedback about me. So, recruiter offered me a position in another team and asked me to come to their office for 4 technical interviews. On-site Interview: Four engineers from an engineering team interviewed me. First Round: A software engineer interviewed me. He brought one of his colleague with him to the interview which I wasn't expecting. He asked me few questions on a project listed in my resume. Then he asked me to reverse a singly linked list. He also asked me SQL query. I solved the query using a different approach which the interviewer wasn't expecting. Initially, he said the way I have written the query is wrong. He wasn't aware that the same query can be written in different ways. I did not expect this from him. However, I convinced him in the end. He asked me how will I write the tables that he had given to me for SQL query in java. In the end there were some follow up questions on the same. He was supposed to interview me for 45 minutes but he interviewed me for 60 minutes Second Round: Since the first interview did not finish the interview on time, second interview started late. As soon as he entered the room he directly went to the white board and wrote a problem. The problem was very vague. He said there are lot of messages and all the messages are unsorted. Sort the messages in ascending order. I started with an assumption which he agreed to when I explained him. But then he just kept confusing me till the end. There was lot of discussion involved. Third Round: I just finished the second round and the third interviewer came up to me and said "Do you have any question?" If no, then we will solve a problem. He didn't give me a chance to relax a bit. He asked me to design an elevator system? Last round was with the director. He asked me system design questions. He told me to draw the architecture of any project written in my resume. Once the architecture was drawn. He asked me to scale it. You should have a good understanding of load balancer, sharding, caching, why to use NoSQL over SQL, replication etc. I did pretty well in this round. He then asked me 4-5 behavioral questions. The interviewer was friendly. Tip: Interact with the engineers while solving problems. Give more emphasis on team player skills during behavioral questions.