Pros
If you have a PhD degree or know a few buzzwords on the latest trends (AI, Machine Learning, Cloud), you'll be right at home. Make sure you wake up early to go jogging with the CEO and his students to stay healthy, embrace the monthly theme (mindfulness, oncall as an unpaid duty, and so on) and enjoy your paid vacations while it lasts.
Cons
- Technical debt is over the charts; not even half of what they tell you at the interviews has been correctly designed, let alone implemented; - Working from Home is considered harmful for your productivity; - no technical interviews: you'll be hired based on how much you increase the company's outside perception (PhD degree, having been on well funded startups, etc); - the CEO reinvents reporting lines every two quarters, despite claiming a flat hierarchy. Entire teams suddenly lost impact/ownership and left for better offers; - your ability to say "yes" to everything the leadership team decides will take you far, even if they change their mind every quarter. Doing otherwise will seriously jeopardise your future at this startup.