Sierra Nevada Corporation Software Engineer II interview questions

I was contacted by a recruiter and had the usual phone screen. A few days later I was scheduled for a phone interview with 2 software engineers, reasonably technical. I was given a coding project and asked to complete it for the in-person interview. Maybe a week after that I was in CO for the in-person. I really liked the environment and building, seems like a really cool place to work and their benefits 401k in particular were pretty good. While I appreciate how casual the environment seemed it was awkward having an interview in a suit and tie while the interviewers wore tee shirts and jeans. Generally they were pretty nice, we went over my code project and they seemed dismayed that the project took me longer to complete than their estimates. While we went over my code on a projector they kept asking me if there were better ways to do what I did and having me make changes. The part that was really frustrating was, I felt as though they expected me to read their minds and they would ask me questions then answer them for me before I really had a chance to think about what they were asking. All things considered I guess I just wasn't suited for them.