don't let the power asymmetry get to you, take that attitude and you wont easily made nervous or uneasy and instead projects confidence
prepare insightful and incisive questions about how decisions are made, tech stacks, even how executives think about dev process and the business etc etc
as it turns out, many companies really appreciate the thoughtfulness!
I found that mindset very powerful.
And the best part, he got an offer but didnt accept it.