I didn't make it as far as you did, I just had a phone screen. I was quizzed a lot about how I would set up a server architecture (something I've never done before) so my answers were obviously a bit basic. Then I was given two algorithms to describe. One of them I knew and described okay, the other one I didn't really know at all and did poorly.

I wasn't asked about any of my previous experience at all. I never felt like I had a chance to show off any of my skills and it didn't seem like they had even read my resume.