It’s really not - lunch is part of the interview. Maybe less technically oriented, but it’s still part of the interview.
[edit:
Wow, so much down votes.
I have interviewed and been interviewed at multiple big tech companies. In all cases the lunch has been part of the interview process, in most I’ve even been given an explicit “this is X, they’ll be talking about Y over lunch”, or it’s been called “lunch interview”.
If the company isn’t treating the lunch period as an interview you’re wasting your engineer’s (or whatever) time, and the candidates.
]
[edit: Wow, so much down votes.
I have interviewed and been interviewed at multiple big tech companies. In all cases the lunch has been part of the interview process, in most I’ve even been given an explicit “this is X, they’ll be talking about Y over lunch”, or it’s been called “lunch interview”.
If the company isn’t treating the lunch period as an interview you’re wasting your engineer’s (or whatever) time, and the candidates. ]