Pros
Working on foundational AI technology, not just some OpenAI wrapper, and if we're successful the upside is huge, The team is incredibly smart in their fields, sometimes I feel like I'm working at Bell Labs in the 60s or something with the way I'm surrounded by expert researchers. Inspiring retreats in beautiful locations in Europe every three months.
Cons
You need to really be comfortable working remotely and async, the team works in a tool called Quire which is task oriented and requires you to keep track of things in a written way.
You don't really have a manager monitoring you to make sure you're working on the right things, so you need to be pretty self-driven and oriented around getting results on your own.
The company is small and the organisation is flat, so there aren't a lot of opportunities to become a middle manager (though, as a startup, there are plenty of opportunities to just grab some important work and do it outside of your official role).
These aren't really positives or negatives per se, but different people might fit well in this or other kinds of companies so wanted to mention.