Pros
Usually if you see problems the management is open to letting you change it. Ownership is big. I mentioned a significant amount of problems with Epic but that also means great opportunity for people willing to take the effort to force change.
Cons
Epic's efficient hiring process, campus, and salary may be alluring but it is a little bit of a trap. It is symptom of their high turnover rate which exists for a reason. They will grind you up and spit you out. Developers are expected to carry a significant burden and often only get to spend 5% of their time actually developing. The rest of the time is spent fighting with Epic's internal infrastructure that only exists because developers got fed up with the fact that the company did not find it important enough create. This problem persists because older developers at the company are used to it and new developers get so fed up they quit early.