The first question was basically "How do our engines work?" I was a bit taken aback because it was the straight-no-chaser type question (they barely introduced themselves). They were very critical of my answers even though they weren't actually all that wrong (looked them up later). The recruiter was unprofessional and canceled the interview without telling me and then took weeks to get back to me. I was offered a second interview, but declined because I had already applied, interviewed, and accepted an offer at a different company by the time she got back to me.