I can confirm that no one asked me a brainteaser or gotcha question. They did, however, ask me irrelevant questions. My system design question involved a web based system. I am an embedded guy with no web experience who was interviewing for an embedded job. I would have been happy to design something in or near my skillset, but I have rarely worked with load balancers, backends, schemas, etc. I did my best and tried to have fun with it, but my interviewer was clearly not amused and seemed slightly annoyed that I didn't know anything about his domain. I was given preparation materials which did not mention anything about web architecture or design, only things relevant to my skills.
The opposite happened to me at triplebyte. There was a whole section on embedded systems and C. My interviewer let me know the section was coming up and I asked if I could just say "I know nothing about embedded systems or C" so we could just explore my web dev knowledge further, but no go. Very weird. I have nothing about either on my resume, and no desire to target any jobs that need me programming anything other than webapps in JavaScript for at least the first couple months...
Triplebyte is supposed to be resume-neutral, so it is reasonable they would try to ask you about it. Surprising they didn't take your word for "I know nothing about embedded systems or C" though... Maybe the interviewer has to go through the motions of asking you everything so that Triplebyte has a complete profile on everyone's performance on every question for their internal data analyses.
