Google Embedded Software Engineer interview questions

Applied online and was scheduled for screen sharing interview. The interviewer did not have embedded systems background at all. I informed interviewer that I just knew the concept but it's hardly used in embedded systems but interviewer was okay with it (infact he was just keen on getting on with coding). If they want to hire people with only computer science background then why even post a job for embedded software profile! I had asked recruiter before about the background of the interviewer and I was told that it would be someone with embedded system background. It was really disappointing.

Was on a Google-Doc. Question was simply based on past software experiences. The interviewer started asking me questions on what my experience was with multi-threading, although limited I did talk to him about having a button handler