In a zero-queue model, each applicant is invited to screening as soon as they apply, for example through an automated screening call, chat or question set, rather than joining a pile waiting for review. Results are scored and added to a ranked list as they come in, so a recruiter opening the role in the morning sees overnight applicants already assessed against the same criteria.
Queues are where good applicants are lost, especially in hourly and high-volume roles where people accept the first reasonable offer. Removing the wait improves speed to contact and treats early and late applicants the same. The model still depends on human oversight: clear job-relevant criteria, scoring that can be explained, and recruiters who review the ranked list and make every decision.