Pros
I joined HubSpot right out of college and I really feel like I've grown incredibly fast as a result of the company growing incredibly fast. From day one, I've been given huge responsibility and a network and room full of bright, helpful people who make it easy to succeed. Our execs are dedicated to making this whole thing happen and it shows- they're extremely appreciative of employees and in touch with the challenges at a high and detailed level. There really is a special culture that comes from that example, and the fact that we treat culture like a first class citizen and prioritize making this an amazing place to work. There's a ton of freedom to take something and run with it and a constant feeling that what you're working on is part of a larger, impactful mission. And, I know everyone everywhere says this but the work/life balance here really is unmatched. I really don't feel like I need to answer to anyone or justify why I got in at 11 instead or 9- that trust just makes for a more comfortable environment.
Cons
There's always more to do and more to learn. That can be good and motivating, but sometimes a little intimidating.