>We have a full-time recruiter working with us, and I'm not 100% sure what tools he used, but I switched to manually reviewing each resume, and given that it was 100s, it took a long time, but I still had my problem of great initial screen, terrible technical interview.

I think it's very scary when even manual review is still yielding you results with horrible technical screenings. I wonder at that point if your technical review is very hard or specific (specific makes sense, yo did you you are looking for esoteric), or if it's just truly that polarized a market. Many are laid off and I imagine those qualified with such specialized knowledge and anchoring themselves instead of searching.

>I also switched to only on-site interviews

Kind of crazy. Not that I mind on-sites, but I haven't even heard a mention of on-site in the interview process since COVID. And I'm basically applying to any relevant position, locally or remotely. Just another curiosity.