Pros
The designers I worked with were top notch and the projects were challenging and meaningful in my first few years. I will forever have amazing friends and connections from Capital One. The offices are nice. Your experience will all depend on who your manager is. I had amazing managers that supported me and my career in my first couple years (but also had horrible, toxic managers that had no clue how to manage people later on.)
Cons
So much turnover and change in the 4 years I worked there. My earlier years there were amazing but things went down the tubes in the last couple years with constant org changes and leadership changes. Current leadership lacks vision and bullies people. Several issues with gender and racial bias happening from the top. Promotions are based on favoritism. Lack of clear career growth and support. Underpays compared to bay area standards. Design is going through some real issues right now, It's really sad because the people and the work were so good, but the current environment is unbearable.