Applicant Tracking Systems were built to help HR teams manage volume. What they have become is an invisible gatekeeper that filters out qualified candidates by the thousands — often for reasons that have nothing to do with ability. The most common ATS killers: using a two-column resume layout, embedding text inside headers or footers, using graphics or icons, and not mirroring the language of the job description closely enough. The fix is simpler than most people think: a clean, single-column document, standard section headers, and a tailored skills block rebuilt from the language of each specific posting.