The recruiter was helpful and very responsive. They tried to keep me updated even when the process became slightly convoluted.

The phone screen was easy and brisk, but the interview day was tiring enough that I ended up reaching a blackout on the last interview.

That being said, most of the interviewers were very friendly and expressed interest, although none of them read my CV properly (I guess this is normal at Google).

Scalability: design a URL shortener service.

I had to estimate the demand myself, assuming the service is popular enough, and design a service that can answer this demand.