Applicant Tracking Systems: How They Work and How to Beat Them

Applicant tracking systems sit between your resume and the human who decides whether to interview you. Understanding how these systems parse, score, and rank applications is not optional knowledge for modern job seekers. It is a fundamental requirement for getting your materials in front of a human reviewer.

How ATS Software Actually Works

An ATS receives your submitted application and performs several functions. First, it parses your resume, extracting text and organizing it into structured data fields: name, contact information, work history, education, and skills. Second, it compares this structured data against the job requirements to generate a relevance score. Third, it ranks candidates by score and presents the highest-ranked applications to the recruiter.

The parsing step is where most applications fail. If the ATS cannot correctly extract information from your resume, your qualifications are effectively invisible. This happens when resumes use complex formatting, unusual fonts, embedded tables, headers and footers, or image-based elements that the parser cannot read.

Popular ATS platforms include Workday, Greenhouse, Lever, iCIMS, and Taleo. Each has different parsing capabilities and scoring algorithms, but they share common requirements for readable, well-structured documents.

Formatting Your Resume for ATS Compatibility

Use a simple, single-column layout with standard section headings. Headings like “Work Experience,” “Education,” “Skills,” and “Professional Summary” are universally recognized by ATS parsers. Creative headings like “Where I Have Made an Impact” or “My Journey” confuse the software.

Submit your resume as a .docx file unless the application specifically requests PDF. While modern ATS platforms handle PDFs reasonably well, .docx files are parsed more reliably across all systems. Never submit resumes as images, infographics, or creative design files.

Avoid tables, text boxes, columns, headers, and footers. These formatting elements create parsing errors where information is placed in the wrong fields, duplicated, or omitted entirely. A resume that looks perfect to a human eye can be completely garbled when an ATS processes it.

Use standard fonts like Arial, Calibri, Times New Roman, or Garamond. Unusual or decorative fonts may not render correctly in the ATS and can cause character recognition errors.

Keyword Optimization Strategies

ATS scoring relies heavily on keyword matching between your resume and the job description. Identifying and incorporating the right keywords is the most important tactical step in ATS optimization.

Read the job description thoroughly and list every skill, qualification, tool, certification, and industry term mentioned. These are your target keywords. If the posting mentions “project management,” “Agile,” “Scrum,” “JIRA,” and “stakeholder communication,” all five terms should appear in your resume.

Use exact phrasing from the job description. If they say “customer relationship management,” use that exact phrase rather than the abbreviation “CRM.” Include both the full term and abbreviation when space permits, as different ATS platforms may search for either.

Distribute keywords naturally throughout your resume. Placing them only in a skills section is insufficient. Weave them into your professional summary, work experience descriptions, and education section. Natural distribution signals genuine expertise rather than keyword stuffing.

Understanding Scoring and Ranking

Most ATS platforms score applications on a percentage basis, comparing the overlap between your resume content and the job requirements. A score of 80% or higher typically places you in the “review” pile, while scores below 50% are often automatically rejected.

The scoring considers several factors beyond keyword presence. Recency of relevant experience, educational qualifications, years of experience in specific skill areas, and geographic location all contribute to the score.

Some systems also evaluate keyword density and context. Mentioning “Python” once carries less weight than mentioning it three times in the context of specific projects and accomplishments.

Common ATS Mistakes That Kill Applications

Submitting a creative or designer resume is the most common fatal error. Graphics, icons, charts, and non-standard layouts that look impressive on paper are completely unreadable to ATS software.

Using headers and footers for contact information is another frequent mistake. Many ATS platforms skip header and footer content entirely during parsing. If your phone number and email are in the header, the system may not capture them, making it impossible for a recruiter to contact you even if your qualifications match.

Failing to customize for each application guarantees low scores. A generic resume that does not mirror the specific language of the job posting will score poorly regardless of your actual qualifications.

Testing Your Resume Against ATS

Several free and paid tools allow you to test how your resume performs in ATS parsing. Jobscan compares your resume against a specific job description and provides a match percentage along with suggestions for improvement.

You can also test parsing by copying your resume text into a plain text editor. If the content maintains its structure and readability in plain text, it will likely parse correctly in an ATS. If the plain text version is jumbled or out of order, your formatting needs simplification.

For comprehensive guidance on building a resume that passes both ATS screens and human review, see our resume writing strategies guide. For organizing your application process effectively, explore our systematic job search plan.

Sources

1. U.S. Bureau of Labor Statistics - Resumes, Applications, and Cover Letters - accessed March 25, 2026
2. LinkedIn - Job-Search Strategies for 2025 and Beyond - accessed March 25, 2026