Just put a little pin in your mind: when you cross 50 employees, there are a new set of HR rules that you have to comply with.
Growth solves (nearly) all problems
Obsess about the quality of the product.
If it works out, you're going to be working on this for 10 years.
The startups that do well are the ones that are working all the time.
... fire fast when it's not working. It's better for the company, it's also better for the employee.