We've had very few false positives. It's a conversation and we understand and appreciate when people say they don't know. We understand that really good enginee

We've had very few false positives. It's a conversation and we understand and appreciate when people say they don't know. We understand that really good engineers say "I don't know how that works." If all of your answers are "I don't know how that works.", it'll be red flags enough for the team. The team of interviewers has a very wide and deep knowledge of technologies (it's kind of a virtuous cycle). We call it out in the pre-interview handout that if you pick something super obscure it'll hurt your chances as the team will struggle to ask good probing questions. The nice thing about this is you're giving the candidate a choice about what they want to describe. Good engineers will choose appropriate topics.