Pros
MediaMath really invests in its people. The interview process is thorough and gives you a good sense of the people and the departments. The compensation is very competitive and the equity is actually meaningful (unlike many companies in this space). There are training programs that range from the industry ingeneral to specific functional areas. High performers are given opportunity to move across teams, departments, and countries, and MediaMath has actually encouraged employees to go out and start their startups (which more than a few have). It's a place the really recognizes the value of people.
Cons
There could be tighter links between some of the departments. Sometimes you find out that someone on another team was doing something similar, so as the company grows it needs to coordinate better between teams.