if it's real that person interviewed at least one candidate per day last year. Idk what kind of engineering role in what kind of org where you even do that.
Sorry this is a little harsh, but how do you get anywhere near 100 people before realizing the approach must be horribly flawed, and devising and implementing a better one? Surely it behooves you to not waste your employer's time, your own time, and the time of all those people you're interviewing (mostly pointlessly).
Edit: there are also recruitment agencies with ex-engineers that do coding interviews, too.