When I left last August, we had around 600 in engineering, around 900 in product and engineering.

Engineering was mostly based in SF but with satellite offices in London and Hamburg. It looks like they were expanding in a large way into a Toronto office too.

Infrastructure was around a fifth of that total but included verticals like search and machine learning infrastructure.

Yelp turned off their last datacentre in early 2018 (IIRC) - and is entirely on AWS.

You may be right. I never counted nor directly asked, that was just the number I overheard. It felt right; afaik, all of the engineering happened in SF, except one remote office in (IIRC) Germany. I know there were a few companies they had acquired (Eat24 and SeatMe) which remained somewhat isolated from the primary Yelp engineering teams (with their own floors of the building and everything), definitely possible the numbers I heard were not counting them.

But he was there 7 years after you so his estimate is probably closer, no?