Pros
IAS is the market leader in the most top-of-mind and relevant sector of the ads industry. While being at the center of this ecosystem comes with challenges, that position also comes with a highly engaged customer base, and a job purview that you won't find anywhere else. The access you get to both clients and agencies is unlike anywhere else, and with tech that works across all platforms, walled gardens, publishers, etc, you really get to see - and engage with - the entire breadth of the industry. This is a great company to work for if you're looking to grow your network, industry knowledge, technical chops, and to work with a fun team while doing it.
Cons
Every company of this size has their unique challenges, and IAS is no different. Systems and processes are imperfect, and the company is constantly making strides to improve them. When it's all said and done, this is a great place to be.