The real problem with phone screens is that unless you (as a recruiter) trust an unbiased third party to do phone screens at the level of rigor that you would do them yourself (rather than being incentivized, as recruiting agencies often are, to try to maximize the number of candidates they give to you), you have to do phone screens yourself with every candidate, requiring NM conversations. If you do solve that problem of trust, then you just need K(N+M) conversations, where each recruiter and each candidate establishes a relationship with one of K third parties, wherein the recruiter is notified about the candidate iff the candidate passes the third party's screens. https://triplebyte.com/ is trying to be such a third party, establishing trust with YC alumni; there are likely others. From a friend going through the process as a candidate, it seems that they have a high level of rigor and are placing him in good later-stage interviews.
