Pros
One of the biggest complaints I hear from peers who have entered into a more-structured, corporate position is that they are generally stuck with their main task and don’t get to branch out into other areas. Whether it’s writing, designing, filling out spreadsheets, or any other task, it’s usually a one-person-fits-one-task kind of position. If that sounds like your startup job, then, I hate to tell you, but you’re doing something wrong. Working at a startup will allow you to try on a lot of different hats, even that weird one that you didn’t think you would ever like, but find out that you did.
Cons
It’s difficult to communicate with other senior. You may also have to get approval from several levels of management before implementing new processes. Additionally, when it comes time for promotions, more coworkers will be competing with you to move up..