Do they go through leetmanage?

You should definitely have a coding task when hiring programmers but it doesn't have to be very big or difficult.

The leetcode style tasks have nothing related to coding for the past 2 decades. That part is solved for a long time now. They ask for knowledge, which is a search away from everybody. I don’t know anybody, who knows those, and not only because of interviews. Also interviewers ask these, yet average code isn’t optimized at all. A simple question, like what’s your opinion of <anything> will tell you more than any leetcode question.