I anticipate a lot has changed since my short tenure, but during my time, FanDuel was an organizational mess from top to bottom. I was only with the company for less than a year prior to being laid off with roughly 20% of the rest of the company, which apparently isn't too uncommon ground there. Very volatile business, not a place worth going to unless you're willing to take a risk.
Most of the people happen to be nice and fun to work with
Little to no job security, used to be a very unpredictable future given legal issues (but perhaps that is changing), poor management that doesn't care to make any effort of transparency