Pros
Great engineering culture, high autonomy, very interesting domain and product, there is lots to learn. It's easy to move between teams to try out different parts. Flexible remote working. There is little delivery pressure, so not stressful at all. It's also quite chaotic so one must be a self starter and able to handle ambiguity - which might not be for everyone but I enjoy it.
Cons
Difficult to get promoted, expectations to get to Senior level are too high - the existing Seniors don't do half of those that are expected from someone trying to get promoted. The salary ranges are not published, so there is a big discrepancy in people's pay for similar jobs, and it's difficult to get a decent raise once you realise you are underpaid. There are engineers doing worse job yet paid higher than others, just because they are more "visible". There is no HR.. if someone has an issue with their manager, there is no one to handle it.