What Is ATS? How Applicant Tracking Systems Work (And How to Beat Them)

You spend an hour perfecting your resume, submit it online, and hear nothing back — not even a rejection. You might assume the company was not hiring, or that you were underqualified. In most cases, an algorithm filtered you out before any human reviewed your application.

That algorithm is an Applicant Tracking System (ATS). Understanding how it works is the single most high-leverage thing you can do to improve your job search results.

What Is an ATS?

An Applicant Tracking System is software used by employers to receive, store, sort, and filter job applications. It acts as a database and filter between you and the recruiter. Well-known ATS platforms include Workday, Greenhouse, Lever, iCIMS, Taleo, and SmartRecruiters.

According to Jobscan, over 98% of Fortune 500 companies and the vast majority of mid-size employers use ATS software. If you applied through a company's website or a job board like LinkedIn or Indeed, your resume almost certainly went through an ATS.

How ATS Parses Your Resume

When you submit your resume, the ATS attempts to extract and categorise every piece of information: your name and contact details, your work history (company, title, dates), your education, your skills. It then stores this structured data in a searchable candidate database.

The parsing step is where most resumes fail. Complex formatting — tables, multiple columns, text boxes, headers and footers — confuses the parser. Skills end up associated with the wrong jobs. Dates get scrambled. Sometimes entire sections are dropped. A recruiter searching for "Python developer, 3+ years" will never find you even if you have 5 years of Python experience — because the ATS could not read your resume correctly.

How ATS Scores and Ranks Candidates

Once parsed, ATS systems score candidates based on how closely their resume matches the job description. This is mostly keyword matching: required skills, job titles, education levels, years of experience. The closer the match, the higher your score. Recruiters typically review the top 10–20% of scored candidates.

The 7 Rules for Passing ATS Filters

• Use a single-column layout — no tables, no text boxes, no columns
• Use standard section headings: Work Experience, Education, Skills, Certifications
• Save as a text-based PDF (or .docx if specifically requested)
• Mirror keywords from the job description exactly — same phrasing, same capitalisation
• Put contact information in the body of the resume, not in a header or footer element
• Avoid images, icons, graphics, and decorative elements
• Use standard fonts (Arial, Calibri, Georgia, Times New Roman)

Does Every Employer Use ATS?

No. Very small companies, startups with fewer than 20 employees, and roles filled through personal referrals often involve a human reading your resume directly. In those cases, a more visually designed resume may actually work in your favour. The rule of thumb: if you applied through an online portal or job board, assume ATS. If you are sending directly to a person you know, design matters.