First round was taken by 2 interviewers and 2 basic programs were asked to code Second round was one on one and basic design question and basic scenario to write Third round was one on one and basic design question and a piece of code to be written. Fourth was with Manager - past work experience, challenging technical tasks. Fifth was with VP - past work experience, challenging project to discuss, just a brief overview. Sixth was with HR-they want to see your commitment in joining Calix. All rounds went well and the process took about a month. They were offering ctc way too less then current ctc.