The first round answers a narrow question: does this applicant meet the role's core requirements and show enough interest and availability to be worth interviewing? A recruiter might review CVs against the must-haves, then run a short call covering experience, notice period, salary expectations and right to work. Some teams use knockout questions in the application form, or a short asynchronous or AI-led interview, at this stage.
First-round screening is usually the biggest bottleneck, because it handles every applicant while later stages see only a fraction. Delays here lose good candidates to faster employers. Asking everyone the same job-relevant questions, scoring answers against a shared rubric and having a recruiter review the results before anyone is progressed or declined keeps this stage quick, consistent and fair.