Capital One Software Engineer interview experience

The technical portion pushed me in a way that was both challenging and specific: I worked through system design questions around a fraud detection system and also talked about validating virtual credit card transactions. It felt like a lot to juggle, but once I got into the flow, the interview became more manageable.

Then came a coding task that ended up being surprisingly familiar—sorting the diagonals of a matrix, similar to a practice problem I’d worked on shortly before. I had a few tense discussions while I iterated on the approach, and there wasn’t much room for hand-waving. After