Pros
Throughout my time at FIS, I have always had knowledgeable, hard-working colleagues. My direct managers (of which I've had several) have been a mix of incompetent and capable, but for the most part have been very good managers. In my experience the company has been fairly flexible regarding working from home and granting time off.
Cons
There is little to no room for advancement within the company, unless you like to take on more responsibility without any significant pay increase. It is very political and promotions seem to be granted based on how well an employee plays politics rather than according to ability. It is extremely difficult to get a raise above 3%. Upper management seems extremely out of touch with what actually motivates employees. The company is highly bureaucratic. Communication from management and between departments could be better.