When I started building the initial version of the Dgraph Go client, we were looking for a serialization format which was fast, easy to use and supported multiple language runtimes. We finally implemented our client using Protocol Buffers which gave twice the speed and consumed two-third memory compared to JSON according to our benchmarks.
4 out of 5 interviewers had liked the candidate. I was one of the 4. He had received either above or very close to 3.0, which is a good score. The interviewer who didn’t like the candidate had been at Google since early 2004. And he didn’t like the candidate’s joke question about whether he was very rich because he joined before Google went IPO. I guess he wasn’t.