You shouldn't be hiring that many. The company might, but the managers and people doing the interviews should be looking at maybe 20 positions per year. They can read résumés themselves and give it some thought.
Who sorts which 20 out of 20,000 resumes go to which managers? Not the managers. Who is “the company”? That’s who is keyword searching/matching/filtering.
The hiring manager. We have got tired of hr rejecting great résumés because they don't understand keywords. They have no clue that qt and qt5 are the same thing, and if we put both keywords on they reject someone with only one. Nor do they get that someone great with c++ is almost automatically great at qt. I'd be happy to teach c++ to someone with rust or Haskell experience if they are willing to learn. (And if it is rust we are open to new work in rust, though we have a lot of legacy c++ you will maintain)
We consider ourselves lucky to get 50 résumés, and if even one isn't obviously disqualified that is a miracle
