If you have applied for jobs online in recent years and heard nothing back despite being qualified, an Applicant Tracking System — commonly called an ATS — may be the reason. Most medium and large employers use ATS software to manage the volume of applications they receive. These systems parse, score, and filter resumes before a human recruiter ever opens one. Resumes that fail to meet certain formatting and keyword criteria are often automatically filtered out, regardless of how strong the candidate actually is.
Understanding how ATS works and writing your resume to work with it — not against it — dramatically improves your chances of getting past the initial filter and into the hands of a real person. This guide covers everything you need to know.
What Is an Applicant Tracking System?
An ATS is software that receives job applications, extracts information from resumes into structured database fields, and often assigns a score based on how well the resume matches the job description. Recruiters then search and filter this database by keyword, job title, location, experience level, education, and other criteria rather than reading every resume individually.
Widely used ATS platforms include Workday, Taleo, Greenhouse, Lever, iCIMS, and BambooHR. Each has slightly different parsing capabilities, but they all share the same fundamental challenge: they are trying to extract structured information from an unstructured document.
Why Resumes Get Rejected by ATS
The most common reasons a well-qualified candidate’s resume fails ATS screening:
- Using tables, text boxes, or columns: ATS software often reads documents left to right, top to bottom in a single pass. Content in multi-column layouts, text boxes, or tables may be read in the wrong order or skipped entirely.
- Using graphics, icons, or images: ATS systems cannot read text embedded in images. Logos, graphical skill bars, or photos may cause parsing errors.
- Missing keywords from the job description: If your resume does not contain the specific skills, titles, and terminology used in the job posting, it may score poorly even if you have the right experience.
- Unusual section headings: Systems look for standard headings like “Work Experience,” “Education,” and “Skills.” Creative headings like “My Professional Journey” may confuse the parser.
- Using headers and footers for critical information: Some ATS systems do not extract text from document headers and footers. Contact information placed in a header may not be captured.
- Non-standard file formats: DOCX and PDF are most widely supported. Pages files, older .doc formats, or image-based PDFs can cause parsing failures. If submitting a PDF, ensure it is a text-based PDF, not a scanned image.
The Right Resume Format for ATS
Use a clean, single-column layout with standard formatting. Here is what to include and in what order:
Contact Section
Place your name, phone number, email address, city and state (not full address), and LinkedIn profile URL at the top of the document in the body of the page — not in a header or footer. Use plain text only — no icons or graphics.
Professional Summary (Optional but Recommended)
A two to four sentence summary at the top of your resume is a useful place to front-load your most relevant keywords and make a strong first impression with the human who reads it after ATS processing. Tailor this section for each job you apply to.
Work Experience
List jobs in reverse chronological order (most recent first). For each position include: job title, company name, city and state, and dates of employment (month and year). Use bullet points under each role to describe your accomplishments and responsibilities. Start each bullet with a strong action verb.
Skills Section
A dedicated skills section is one of the most important elements for ATS optimization. List your technical skills, tools, software, certifications, and relevant competencies. This is the section where including keywords from the job description is most impactful.
Education
Include degree, major, institution name, and graduation year. If you graduated within the last two years, you may also include GPA if it is strong and relevant certifications or honors.
How to Match Keywords From the Job Description
This step is the most impactful thing you can do to improve your ATS score for a specific application:
- Print or copy the job description into a separate document.
- Highlight every specific skill, tool, certification, job title, and area of responsibility mentioned.
- Identify which of those terms accurately describe your own experience.
- Incorporate those exact terms naturally into your resume — in your skills section, in bullet points, and in your professional summary.
For example, if a job description mentions “project management,” “Agile methodology,” and “Salesforce,” and you have experience with all three, those exact phrases should appear on your resume. Do not paraphrase — ATS systems match strings of text, not concepts.
However, do not stuff keywords you do not actually have experience with. If a human recruiter reads your resume after it clears ATS, they will catch any misrepresentation quickly. The goal is accurate reflection of your skills using the language the employer uses, not keyword inflation.
Quantify Your Accomplishments
Both ATS systems and human readers respond well to specific, measurable accomplishments. Compare these two versions of the same bullet point:
- Weak: “Responsible for managing social media accounts.”
- Strong: “Managed four corporate social media accounts, growing combined follower count by 34% and average engagement rate by 18% in 12 months.”
Numbers stand out visually and provide evidence of impact. Wherever possible, quantify results: revenue generated or saved, team size managed, percentage improvements, volume of work handled, or time to completion.
Tailor Your Resume for Each Application
Sending the same generic resume to 50 jobs is far less effective than sending a tailored resume to 15 carefully chosen positions. Each tailored version should use the specific language of that job description, have a customized professional summary, and lead with the most relevant experience for that particular role. This takes more time per application but results in a significantly higher response rate.
The CareerOneStop Resume Guide (sponsored by the U.S. Department of Labor) provides a thorough, free resource for job seekers at all levels.
Common Resume Mistakes to Avoid
- Listing responsibilities instead of accomplishments — focus on what you achieved, not just what you were assigned to do.
- Using a resume template with heavy design elements — these often fail ATS parsing.
- Including a photo — in the U.S., this is not standard practice and can introduce unintended bias.
- Going back more than 10-15 years in work history unless the older experience is directly relevant.
- Using first-person pronouns — resumes are written in an implied first-person voice without using “I.”
- Listing references or writing “References available upon request” — this wastes space and is understood to be implied.
Length Guidelines
For candidates with fewer than ten years of experience, a one-page resume is generally preferred. For experienced professionals with ten or more years of relevant experience, two pages is appropriate. Three or more pages is rarely justified unless you are in academia, research, or a field where a curriculum vitae (CV) is the standard rather than a resume.
After ATS: Making the Resume Work for Humans
An ATS-optimized resume still needs to impress a human reader. After ensuring your resume is parseable and keyword-rich, read it aloud to check that it flows naturally. Ask a trusted professional to review it. Check for typos and inconsistent formatting. The recruiter who opens your resume after it clears ATS is deciding in six to ten seconds whether to read further — a clean, easy-to-scan layout with strong accomplishments makes that decision easier.
Additional free tools and resources for job seekers, including sample resumes by industry, are available through the Bureau of Labor Statistics Occupational Outlook Handbook, which also provides salary data and career growth projections to help you target your job search.
Quick ATS Resume Checklist
- Single-column layout with no tables, text boxes, or graphics
- Standard section headings: Experience, Education, Skills
- Contact information in the main body of the document
- Keywords matched to the specific job description
- Saved as DOCX or text-based PDF
- Accomplishments quantified with numbers where possible
- Tailored version for each application
- Proofread for errors and consistent formatting
Getting past ATS is not about gaming the system — it is about communicating your qualifications clearly and precisely in a format the system can read. Master that, and your resume will reach the humans who make hiring decisions.
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