Pros
I worked with incredibly talented people who were genuinely dedicated to building the future. The benefits and pay were fair as well until you get overworked because of all the reorgs.
Cons
CEO has a massive ego, it is no secret, anyone who worked at Mongo will tell you the same thing. He literally screams in meetings and has an iron fist over every product domain and will suck the joy out of any passionate engineer. The company has had no real customers for years, SE and Eng builds bespoke solutions for every customer which is not scalable at all for a company. The culture went from happy and exciting to toxic and miserable. By the time I left about 20 people had quit. And they did layoffs as well but framed it as performance based firing.