Pros
Very nice colleagues with good managers who are oriented towards problem solving. Management is ruthlessly focused on growth so seems like this company will do well in the long term. The CEO may be young and may not have any other experience besides Handshake, but he has built a very successful business and surrounds himself with smart people.
Cons
I can't express this enough: there is absolutely no work/life balance here. People are discouraged from ever taking any of their supposedly "unlimited" PTO by a culture of nonstop work, blackout dates, and the expectation that you'll be on email/slack on the few days you do manage to get off. Management has been made aware of employee unhappiness about this in multiple public forums but it has never been taken seriously and apparently they don't seem to think it's a problem.