Google (Senior) Software Engineer interview questions

Good- the technical challenge was insane. The interviewer was very personable and helpful during the challenge because it was quite the algorithm needed to solve it- was able to get it done

First recruiter a 30min call with recruiter. Then an online coding interview which I did in 30 min, allowing me to chat with the guy for another 15 min. Second round of coding interview on site. It was a sliding window question which is considered easy for Google. System design was harder than expected, lots of questions about scailability.