Interview was in three phases: (1) Recruiter asks basic programming questions to ensure that I had fundamental knowledge. (2) Phone interview with a tech at CoStar. More like a screening; he asked questions about the nature of my work, obviously to see how I would respond, to determine whether I was familiar with principles endemic to the position that they sought to fill. (3) On-site technical interview. Here, it was just me and another guy in front of a huge screen, he gave me a mouse and a keyboard and told me to make some very specific stuff happen. This went pretty smoothly until he questioned me on something that wasn't anywhere on the job description that they posted online and gave to the recruiter. I was completely blindsided, and failed miserably. Wind went out of my sails after that, I just wanted it to be over. We shook hands and I left.