They're one of those clients who are doing some ridiculous cool stuff, some of which we unfortunately can't talk about yet. But: insurance (and more generally: benefits), payments, one card to make all of those things waaaaay easier to use, think big :-) Certainly no dearth of interesting cool security work to be done and a company that's big enough to have interesting work and small enough you can actually leave a mark on it.
Contact details in bio as usual.