A recruiter found me on LinkedIn. She is very professional and super nice.

I sent her my resume via email, answering a few questions about my background in techniques and research, and about school and employment.

She planned a 45-minute phone interview for me with a technician. I answered two technical questions during the call.

The tech question wasn't really hard. I answered the basic solution, and then was expected to provide a more efficient solution. Finally, the problem had to be solved in a scalable scope.

I bet these should have been completed in 20 minutes at most, but that took me 40 minutes. Of course, I didn't get further in the interview.