Castlight Software Engineer interview questions

Interview process is easy, if you have practiced medium level leetcode questions and you are clear with your fundamentals and know your past projects well Total 4 technical rounds: 1) L1-Coding 2) L2-Coding & Fundamentals 3) L3-Questions on Language & Fundamentals 4) Hiring Manager Round

I had a talk with one of the recruiters at the UC Berkeley Career Fair and received an email and a call a few weeks later to set up a phone screen and in-person interview. I went to SF for an on-site and was placed in a room for 4 interviews but only one of the interviews was in person and the rest were through a video. I was wondering why I was even asked to come in person given that most of the interviews were virtual. One of the interviewers over the video call was very difficult to understand and I was unable to comprehend his question because of the poor audio quality. The office, however, is really cool and in a great location in SF.