Pros
- Incredible Culture - Flourishing Environment - Outstanding Benefits - Wonderful growth opportunities - Recognition for the efforts that you put in MongoDB is still considered to be a growing organization so you can see a lot many positive changes. If you are adaptive and up for challenges on daily basis then this is a perfect company for you. You learn to be creative and innovative whilst working and you get recognized for it. Also, you are not bound to be in the same domain. You can explore your options in different parts of the company. I have seen many internal transfers based on talent and interests.
Cons
There are no downsides at all. Rather I'd say, if you ended up liking it too much, you'd put in more hours voluntarily because you see the impact you make.