Pros
The actual employees who work here are intelligent and considerate. They have incredible levels of patience and professionalism. They'd do extremely well anywhere else and are some of the best teammates I've had. If you've spent most of your career at large companies, you'll probably get more substantial engineering experience at an early-stage startup. However, this company has been around for over three years, and there isn't much interesting work left in the pipeline.
Cons
The two founders are deeply unethical and incompetent. They publicly insult employees, dismiss and become defensive over disagreement, waste time micromanaging trivial problems, and devote significant engineering resources to technical projects without any proven business purpose. If you disagree with them technically, they'll often become flustered and attack you personally, having no other ground to stand on. They use ridiculously silly terms like "alpha" to describe themselves. They've been caught outright lying many times. They gossip about employees to other employees. You may not personally be targeted, but you'll see your fellow co-workers take the brunt. This has been brought up with management several times. There was agreement this was a problem, but they seem unable to fix anything. There's a surprising lack of rigor and logic when it comes to running the business and engineering roadmap. Decisions are made based on emotions and vague references to past experiences. There's an overall aversion to communication from the founders towards the rest of the team. The employees have learned to solve problems without them, which, while it speaks to the capabilities of the team, does not make for a good environment. The founders are engineers by training, but they seem to have regressed, unfortunately. They hold their employees to certain standards but feel free to commit bad code themselves. They waste immense amounts of time demanding conformance to a style guide they don't themselves follow. There's been a mass exodus over the past year. This would be worse than Uber if it were a larger company. Avoid.