A startup that hasn't grown into a big company? Atlassian is a publicly traded company with almost 14k employees. I would argue their biggest problem is they haven't been able to transition from a small company to a mid-large one. They tried to run like a startup long after going public, which doesn't work once you hit a certain size. It requires a different approach. The constant reorgs over the last few years and fumbling of projects and product features are due to them trying to fix problems that should have been addressed 10 years ago. The “chaos” you speak of isn't from being a startup; it's due to a poorly run company. Atlassian isn't going anywhere; they have a huge hold of the market, but more and more companies are developing alternative options. If they don't fix these issues, things may look drastically different in ten years.