Pros
Low ego and collaborative culture. Being proactive will help you get ahead here. From my experience, hard work goes noticed as does humility. There is a lot of opportunity here but, in line with the title, being ambitious and proactive is a key to capitalizing on that opportunity. Since working here I've seen a shift in focus, specifically around product, towards disrupting the big players in mobile advertising. Things may have seemed stagnant from a product perspective some time ago, but the company was experiencing rapid, organic growth. This isn't unique to Vungle but I'm glad it is being addressed.
Overall, the culture, opportunity, company trajectory, and collaborative is great here. Typical start up perks include catered lunches, lunch stipend on non-catered days, commuting reimbursement, snacks/food/beer/wine/etc, and gym reimbursement. Pretty impressive for a company of this size.
Cons
Lack of maturity with middle management with respect to professional experience. This isn't to say middle managers are immature, but relatively early in their careers' for the position that they're in. This also doesn't go for everyone, but in certain departments there are people who are still figuring out their path that could be replaced with someone who could add much more value. Some higher level managers/VPs seem to get too caught up in the weeds but that is expected in a business at this stage.
Another con would be the lack of data quality & knowledge of legacy systems. For a company this young, obtaining clean data shouldn't be such a struggle.
Finally, the ambiguity around high level strategy from top management is somewhat discomforting. I'm confident it doesn't mean bad news but some more transparency would be appreciated.