Jobscan’s 2025 analysis detected an applicant tracking system on 97.8 percent of Fortune 500 career sites. When you submit a job application online at any large employer, software reads your resume before any person does. It parses the document, extracts information, and scores how closely your application matches the job description. If the score is too low, the application is filtered out and no human sees it. Understanding how this works is not optional if you are applying for jobs at companies that receive large volumes of applications.
What an ATS actually does
An applicant tracking system is a database that stores applications and helps recruiters search and filter candidates. The system scans your resume for keywords, job titles, skills, and dates, then ranks candidates according to how closely they match the requirements set in the job posting. The ranking determines which applications a recruiter reviews first, and often which ones they review at all.
Modern ATS platforms go beyond simple keyword matching. They parse your resume into structured fields: contact details, employment history, education, skills. If the document is formatted in a way the system cannot read cleanly, your information may not be parsed correctly even if the content is strong. A resume that looks excellent to a human eye can score poorly if the underlying formatting confuses the parser.
Formatting: what to do and what to avoid
The core principle is machine readability before visual design. A clean, simple layout outperforms a creative one in ATS scoring, because design elements that look distinctive to a human, such as columns, tables, text boxes, and graphics, often produce parsing errors. Over 70 percent of job seekers fail the initial ATS screening, and formatting problems account for a significant share of those failures.
Use a single-column layout. Keep section headings standard and recognisable: Work Experience, Education, Skills, Certifications. Avoid headers and footers, which many systems ignore entirely. Use a common font at a readable size. Save the file as a Word document (.docx) or a simple PDF, not an image-based PDF, which cannot be parsed as text. Do not embed your contact information in a header or image field.
Keywords: how to use them without keyword stuffing
The most direct way to improve your ATS score is to mirror the language of the job posting. Systems are looking for the specific words the employer used, not synonyms. If the posting says “project management” and your resume says “led initiatives,” the system may not make the connection even if the experience is identical.
Read the job description carefully and identify the skills, tools, and job titles that appear most frequently. Use those exact terms in your resume, integrated naturally into descriptions of your actual experience. Listing keywords in a block without context, a tactic that circulated years ago, no longer works on modern systems and often triggers spam filters. The goal is natural use of relevant language, not repetition for its own sake.
Tailor your resume for each application. A single generic resume cannot match the specific language of multiple job postings effectively. The tailoring does not need to be comprehensive: adjusting the summary, updating the skills section, and ensuring the most relevant experience is described in the employer’s language is usually sufficient.
Content: what the system is looking for
Quantify achievements where possible. Systems that evaluate semantic relevance, not just keywords, score resumes higher when accomplishments are described with specific numbers and outcomes rather than vague responsibilities. “Reduced customer response time by 30 percent” is more parseable and more convincing than “improved customer service.”
Include a dedicated skills section that lists the tools, technologies, and competencies relevant to the roles you are applying for. This gives the ATS a clear, scannable reference point separate from the narrative of your work history. Update it for each application to reflect the skills emphasised in that specific posting.
Use the reverse-chronological format for work history: most recent role first, working backward. This is the default expectation for ATS systems and recruiters alike. Functional or skills-first formats, which were once recommended for career changers, tend to perform poorly in ATS screening because they obscure employment history in ways systems are not designed to accommodate.
After the ATS
Getting past the ATS is a necessary step, not the end goal. A resume that is optimised purely for keyword matching but is thin on substance will not hold up when a recruiter reads it. The aim is a document that passes the system because it accurately reflects strong, relevant experience described in language the employer recognises. Those two things should be true simultaneously, not in tension.
Several free and low-cost tools can test your resume against a specific job description before you apply: Jobscan, Resumeworded, and Resume.io all offer ATS simulation features. Running a check before submitting takes a few minutes and can identify gaps that are easy to fix. Given that the alternative is submitting into silence, it is worth the time.