An Applicant Tracking System (ATS) is software used by employers to automatically filter job applications before a human ever reads them. Over 98% of Fortune 500 companies use ATS software — and studies show that 75% of resumes are rejected by ATS before reaching a recruiter. This guide explains exactly how these systems work and what you can do to consistently pass them.
An Applicant Tracking System is a recruitment software that collects, organizes, and filters job applications at scale. When you submit a resume online, it goes through an ATS before any human sees it. The system parses your resume, extracts information, and scores it against the job requirements. Only applications above a certain threshold reach a recruiter's inbox.
The most widely used ATS platforms include Workday, Taleo, Greenhouse, Lever, iCIMS, and BambooHR. Each has slightly different parsing capabilities, but they all share the same core logic: keyword matching, section identification, and relevance scoring.
ATS systems score your resume on several factors. Understanding each one helps you optimize strategically rather than guessing.
The primary scoring signal. ATS systems extract keywords from the job description — skills, tools, job titles, certifications, and action verbs — then count how many appear in your resume. A resume with 80% keyword coverage scores significantly higher than one with 40% coverage, even if the underlying experience is identical.
Critical insight: ATS systems often match exact phrases, not synonyms. If the job posting says "project management," use that exact phrase — not "managing projects" or "project coordination." Both may describe the same skill but only one will match.
ATS systems look for standard section headers to categorize your information. "Work Experience," "Education," "Skills," and "Summary" are universally recognized. Creative alternatives like "Where I've Been" or "My Journey" often confuse parsers and cause information to be miscategorized or dropped entirely.
Most ATS systems struggle with complex formatting. Elements that cause parsing failures include:
ATS systems parse dates to verify employment history and calculate experience duration. Inconsistent date formats, employment gaps presented unclearly, or overlapping dates can cause scoring errors.
| Score Range | Typical Outcome | What It Means |
|---|---|---|
| 85–100% | Strong candidate flag | Recruiter likely contacts you directly |
| 70–84% | Passes to recruiter review | Your resume enters the human review pile |
| 50–69% | Borderline — often rejected | May pass at lower-volume companies only |
| Below 50% | Auto-rejected | Never reaches a human reader |
Read the job posting carefully and note every skill, tool, and requirement mentioned. Then ensure each appears in your resume using the exact same phrasing. This is the single highest-impact optimization you can make. Studies show resumes that mirror job description language score 40–60% higher than those that don't.
Two-column and designer resume templates look impressive to humans but confuse ATS parsers. The parser reads left-to-right, top-to-bottom — a two-column layout causes it to mix up content from different sections. Use a clean single-column format for ATS submissions.
Use these exact headings: Work Experience, Education, Skills, Summary or Professional Summary, Certifications. Avoid creative alternatives. If the ATS can't identify a section, the content inside it won't be scored.
A dedicated Skills section is the easiest place to increase keyword density. List tools, technologies, and competencies using the exact terminology from the job posting. "Microsoft Excel" and "Excel" may score differently depending on the ATS.
Numbers increase both ATS scores and human reader interest. "Increased sales by 34%" scores better than "increased sales significantly." Use metrics wherever possible: percentages, dollar amounts, time saved, team sizes, and customer counts.
Most ATS systems handle .docx and simple PDF files best. Avoid image-based PDFs (scanned documents), PDFs from Canva or design tools that embed text as paths, and any format that requires special software to open.
Upload your CV, paste the job description, and CareerCraft AI will calculate your ATS match score, identify missing keywords, and rewrite your resume bullets to maximize your score.
Get your ATS score free →An Applicant Tracking System (ATS) is software used by employers to collect, sort, and filter job applications before a human recruiter reviews them. Over 98% of Fortune 500 companies use ATS software.
ATS systems score resumes by matching keywords from the job description against your resume content, checking formatting compatibility, and assessing section structure. Higher keyword match rates produce higher scores.
Most recruiters use a threshold of 70–80% ATS match score before manually reviewing a resume. Scoring above 75% significantly increases your chances of reaching a human reader.
Yes. Most ATS systems cannot parse content inside tables, text boxes, headers, or footers. Use simple single-column formatting with standard section headings for maximum compatibility.
Yes — ATS systems often match exact phrases. If a job posting says "project management" use that exact phrase rather than "managing projects." Both synonyms and variations may be missed.