Hiring outcomes are usually examined at the interview and selection stages. A great deal of filtering has already happened by then, produced by the text of the job posting itself.
Requirements are read as thresholds
Applicants treat a list of requirements as a checklist. Anything phrased as required tends to be read literally, even where the employer intended it as a preference.
Readers differ in how they respond to a partial match. Some apply anyway; others screen themselves out, and the tendency to self-screen is not evenly distributed across groups.
The practical effect is that a long requirements list shrinks the pool asymmetrically. The employer never sees the candidates who decided not to apply, so the filtering is invisible in hiring data.
Proxy requirements stand in for skills
Postings often ask for a degree, a number of years of experience, or experience at a particular type of employer, as shorthand for capability.
These proxies are cheap to screen on but imperfect. A person can hold the underlying skill through routes the proxy does not recognize, including military service, self-teaching or work done overseas.
Skills-based hiring, which specifies what a person must be able to do and then tests it, is an attempt to replace proxies with direct evidence. Adoption has been uneven.
Credential inflation happens gradually
When applications are plentiful, raising requirements is an easy way to reduce screening volume. The added requirement is rarely removed when volume falls again.
Over successive rewrites a role can acquire requirements that no current holder of the job originally met, since each hiring manager edits the previous posting rather than the actual work.
Comparing a posting against what current post-holders actually do is the usual corrective, and it is a step many organizations skip because postings are copied forward unchanged.
Language choices shift who responds
Tone, jargon and framing affect response rates. Postings dense with internal acronyms signal that familiarity with the organization is already expected.
Statements about flexibility, accommodations, pay range and location are read closely by candidates weighing whether to spend effort on an application at all.
Several states now require pay ranges in postings, which changes candidate behavior by removing one source of uncertainty. These requirements differ by jurisdiction and continue to change.
Why this stage is measured least
Organizations can count applicants, interviews and offers. They cannot easily count the people who read a posting and closed the tab.
Proxies exist, including view-to-application ratios and comparisons across differently worded postings for similar roles, but these require deliberate tracking that most employers do not set up.
Without that measurement, the posting is treated as a fixed input rather than a decision, which is why the same wording often survives for years across many hiring rounds.