Second round was system design, again with a friendly interviewer. The question was quite basic and she was happy with my response. She didn’t ask many follow ups and we ended early as a result. Overall the best round during my 3 rounds of interviews.
Final round was with an impatient interviewer. He didn’t seem too pleased my responses and added some behavioral questions despite it being another system design round.
Got feedback and only the third interviewer had some negative feedback; all other feedback was positive.
Overall, the experience was fine but I’d recommend not studying specific types of questions but rather on fundamentals and core skills. As you can see, my interviewers all had different styles and went into different amounts of depth.
Good luck to anyone preparing for Google!