Pros
Competitive compensation
All C level staff are very technically competent, among the best programmers in the organization.
As such, they can quickly recognize good talent & more importantly can foster good talent if the will to learn is there. Benefits are two fold here: you can safely expect to receive raises and bonuses for your technical competency that would have not been recognized at other workplaces and you can trust your co-workers not to drag you down in a project.
Do your work when you want. No one is going to micromanage or hassle you about when you do your work as long as you complete it on time and produce good work. Huge benefit to anyone who knows what they are doing.
Fast growing company, there is always opportunity to take on bigger roles as they prefer to promote from within rather than outside hiring.
Get to work with a wide variety of technologies and best practices. If you are someone who enjoys working with cutting edge technology and writing clean scalable code this is the place for you.
Cons
Health benefits can use a little work, team is all very young so this may not be top of mind.