There were 3 rounds. All 3 rounds were good. First round was like little bit coding and concepts and how things work. Second round was combination of system design , patterns and code optimization and how would you redesign the product by having different spec or constraints which is interesting. and the third round is Pure Architect level like how do you design a full application from start to end. Interviewers were great. they push you to figure out or find optimal solution. and if you cam across any terms that you havent worked. They explain it to you so you know about that.