The people. It's hard to walk into the kitchen and not strike up a conversation or "hello" with a coworker. Everyone's always working on something interesting.
People are motivated and are prepared to work together. Bird is starting to build more corporate systems, but there is still plenty of opportunity to go above and beyond and drive impact on a team you'd love to be a part of.
Leadership team seems to be aligned very consistently, and is capable of reigning in change when needed. They are fast and focused on the mission. Also leadership team is... cool. Like you kind of want to be friends with them because they're all cool.
Everyone is smart, driven, easy to work with, and above all: kind. It is extraordinary how nice people at this company are. There's still a handful of people who withhold information, but for the most part it is easy to talk to anyone about anything.