Pros
Work with a small and tight-knit team. Working in a highly motivated environment (zero negativity in the office and everyone is there to help each other out - It actually feels like a team). Awesome social culture (we go out often as a group and make sure we celebrate important milestones). We recognize each others' hard work and make sure to play as hard as we work. Dog friendly office. Get to experiment with new tech all the time (GraphQL being the latest) and devs have a lot of say with regards to which tools to use to solve a particular problem. Our dev culture prefers functional programming paradigms (we have Scala, and Rust programmers and I myself like learning Haskell).
Cons
Depending on your perspective it might be viewed as bad that there's lots of work to do. This is definitely not a place for people who just want to coast. We're all motivated to create a massively successful company and our commitment to success shows. There are occasional late nights but they're quite rare. On the bright side, when there's a late night we typically blast music at the office and have pizza. There's just so much to do that it might feel overwhelming sometimes, so it's important to prioritize work and be a pragmatist. Perfectionism can hurt.