What is there to say about this one? There isn't much I can tell you about what I've done for Cap One because it isn't public yet, banks being all super secretive and all. But what we did was the stuff of legends.
On a more high level note however, I have done work to support their core API's that are leveraged in every Capital One iOS Application. I've worked on two separate apps so far and have even done POCs for different potential features they may want to implement in the future. Adding to that, I have worked with many iOS Devs through Cap One that are well respected in the iOS community.