Lyft Senior Software Engineer interview questions

The recruiter reached out to me and we scheduled a technical phone call. In the interview, we gave our introductions. I mentioned I have 7 years of exp. The interviewer asked a good technical question. The question verified if the candidate can gather requirements, solve problem and code it. I finished it in time. He asked a follow up question, I struggled there bit and time was over so we stopped it there. I went through with this interview but they wanted to be sure so they scheduled another technical phone screen. In this interview, interviewer asked in depth about my current experience, project details etc. He asked me the difference between an array and a linked list. I fumbled there for a bit since I was not expecting a theoretical question for 7 years of experience! Anyway, I could answer it well. Then the interviewer asked a technical question based on graphs. I told him that I have never worked in graphs in my career so I started solving the problem without graphs and I almost reached solution when he asked me to solve it only using graphs. I told him again that I am not very familiar with all graph concepts and needed to brush up my knowledge. Then he explained me the solution and we kept the call.