I worked at American Express for 10+ years. great pay, work/life balance, benefits. Job growth opportunities ,Good environment, Diverse employees Great people to work with.
They have fantastic pay for the position you're in, and they teach you interesting and engaging utility of modern technology mixed with legacy fundamentals. I've learned quite a bit while AmEx while getting paid more than fairly - I'd recommend a stretch here to whomever may be reading this!
Inconvénients
The Company is huge, and at times it may take more than a little time to get recognized for your abilities and the growth you've had. There's a reason there is a "only way up is out" reputation exists for some enterprise companies...