> And 2 years is probably pretty average for the whole tech industry.

maybe for a fungible CRUD engineer. I think Karpathy is in a different league and I'm certainly surprised to hear this fact. I would expect someone like him to sit within a certain lab for a long time

Depends on the country, I guess. In Europe, it would definitely not be the norm and I would definitely call previous employers if it was several 2 year stints.

The folks I know who bounce that often are generally mis-hires:

- barely qualified, leaving to avoid getting PIP'ed

- overqualified/under-leveled, and moving is faster than getting promoted