Pros
Working at ZeroEyes was a highlight in my experience. The pace was amazingly fast, never boring. The leadership was smart, humble, and approachable. The mission, to end gun violence particularly on school campuses, and the level of commitment to the mission that the organization has built into their culture makes going to work feel like a blessing. Working with such a talented and diverse group, all of whom are so passionate about what they are doing, gives you a sense of purpose that I can't really explain. Working for a company at this stage also gives you flexibility to build your role and find out how you can add the most value to the organization. They are extremely flat in terms of having a voice, the lowest ranking employee has the same impact when speaking up, which is encouraged heavily. Super fun, safe, and accepting environment.
Cons
Not really a con per se, more of a warning: If you don't believe in the mission, don't bother. They are so committed, so passionate about the work and the mission, that it would be impossible to "fit in" or "belong" at the organization without sharing that sense of purpose. That being said, it is a contagious atmosphere so its also really difficult to work there and not contract the same passion and purpose.