Pros
Great place to be immersed in a complex environment with daily challenges, highly customer focused, FIS is an industry leader, almost any position has something you can be promoted to down the road, new equipment purchases for networking gear and servers seems plentiful as long as justified, an amazing place for a beginner or intermediate skillset to learn, leadership is trying to make investments for changes, ability to work from home in many positions (only reason the seasoned stay in many cases), most direct managers are great to work for and seem to genuinely care about their employees, upper management is trying to address the many concerns the technical staff has been bringing up for years.. but they are not handling it well (buying 3-4 competing tools managed by competing groups rather than having a cohesive plan where everyone works together and accomplishes something great). Additional comments: I would only recommend FIS to a friend because you can in many times work from home, the pay is in line with other large companies, and many of the people you work with are enjoyable to work with.
Cons
Very high workloads with ever smaller groups as people get shuffled around, lots of org changes all the time, lots of overseas workers (this is good and bad.. in some cases it becomes a challenge when the skillset you need is not coming up in the areas you are allowed to hire from, even when someone domestic is available), poor communication from management (this has gotten much better over the years, but is still a challenge.. see "Advice to Management" below), is highly customer focused (this is a pro and a con, the con outweighs the pro.. mostly because the customer focus overshadows internal technical recommendations), in line with the last one: upper management does not listen to or trust technical recommendations (somewhat getting better.. but only slightly), no BYOD and provided laptops are not the best, upper management (at least 1-4 levels above the direct managers I have worked for) do not seem to genuinely care about work-life balance or the impact of what they ask of their employees (many talk about not ignoring your work-life balance while at the same time putting an immense work load on you, with short time frames, on a holiday). No training... and not provided at regular intervals.