ATS resume guide: what actually gets filtered, and what's a myth

An applicant tracking system is the database a company's recruiting team works in. Greenhouse, Lever, Ashby, Workday, iCIMS, SmartRecruiters and Workable are the names you'll see in application URLs. When you apply, the ATS:

1. Stores your application: the form answers, your CV file and any cover letter.
2. Parses your CV into text and, in many systems, into fields such as name, email, employers, titles and dates.
3. Makes you searchable. Recruiters search and filter candidates by keywords, answers to screening questions, location and stage.
4. Tracks the process: stages, interview feedback, emails and the final decision.

Some systems add match scores or AI ranking that sorts applicants by how closely they fit the job. That ranking decides who gets looked at first in a busy pipeline, which matters, but it's a priority order, not a rejection.

The famous figure traces back to a 2012 sales pitch from Preptel, a company selling resume-optimisation services; it published no methodology and closed in 2013 (The Interview Guys). The number has been repeated ever since without a source.

When Enhancv interviewed 25 US recruiters about it, only 2 of the 25 said their ATS was set up to reject applications automatically based on CV content. The common pattern was knockout questions for eligibility plus human review guided by scores (Enhancv). One recruiter put it simply: the systems they had used didn't disposition anyone; a person had to do it.

The ATS isn't reading your CV and deleting it. People are, quickly, and usually after a few screening questions have already done the sorting.

1. Knockout questions

"Are you authorized to work in the United States?", "Do you require sponsorship?", "Do you have a bachelor's degree?", "How many years of Kubernetes experience do you have?". A wrong answer to a required question can move an application to "rejected" automatically. This is the real auto-reject, and it has nothing to do with your CV's formatting. Answer honestly; a mismatch found later ends the process anyway. If location is the issue, read our guide on how to tell whether a remote job is open to you.

2. Volume and timing

Popular roles get hundreds of applicants. Recruiters review in order, build a shortlist, and stop. About half of the recruiters in Enhancv's interviews (52%) said applying early improves a candidate's chances, simply because the shortlist isn't full yet.

3. Exact-match criteria

In the Harvard Business School and Accenture Hidden Workers study, 88% of employers surveyed agreed that qualified high-skill candidates were screened out because they didn't match the exact criteria in the job description (HBS). A recruiter searching for "Terraform" won't find a CV that only says "infrastructure as code". This is where keywords matter: not to trick a robot, but to be findable by a person using a search box.

4. A quick human scan

Once a recruiter opens your CV, they're looking for the job title, recent employers, the must-have skills and whether you're eligible. If those are hard to find, because of a dense layout or a generic summary, the scan ends early.

Modern ATS parsers handle ordinary, text-based PDFs and Word files well. Problems come from layouts that scramble the reading order or hide text. These are the issues we see most often when our own parser reads CVs:

• Two-column layouts. The sidebar (skills, contact details) can end up interleaved with your job history, line by line.
• Text in images, icons or text boxes. Skill logos, rating bars and contact icons carry no text a parser can read.
• Unusual bullet glyphs and letter-spaced headings. "E X P E R I E N C E" becomes ten one-letter words.
• Contact details only in the page header or footer. Some parsers skip headers; repeated headers on every page add noise.
• Scanned PDFs. A photo of a CV has no text layer at all.
• Creative section names. "Where I've made an impact" is harder to map than "Experience".

What's safe: a single column, standard headings (Summary, Skills, Experience, Education), dates in a consistent format such as "Mar 2022 – Present", a normal font, and a PDF exported from Word or Google Docs (not printed to image). Submit a .docx if the employer asks for one. Our ATS resume checklist walks through all of these in two minutes.

A quick self-test: open your PDF, select all, copy, and paste it into a plain-text editor. If the order is wrong or words are broken, an ATS will see the same thing.

The useful version of "ATS keywords" is simple: describe the experience you really have using the same words the employer uses.

• Use the ad's exact term once, in context. If it says "CI/CD" and your bullet says "build pipelines", write "CI/CD pipelines (GitHub Actions)".
• Spell out acronyms once: "Site Reliability Engineering (SRE)". Recruiters search both ways.
• Put must-have skills in two places: the Skills section and a bullet that shows you used them.
• Mirror the job title where it's honest, for example in a one-line headline under your name. Never change your past job titles.
• Don't stuff. White text, a pasted copy of the ad or a list of 80 tools shows up in the parsed text the recruiter reads, and it looks like what it is.

To see which skills employers in your field actually ask for, our resume keywords by role pages count them across live job postings, for example DevOps engineer or data engineer.

• File type: a text-based PDF is fine for Greenhouse, Lever, Ashby and Workday. Use .docx when the form asks for it.
• File name: "Firstname-Lastname-CV.pdf", not "cv_final_v7.pdf". Recruiters download and forward files.
• Length: one page early in your career, two for most experienced candidates. Seven-page CVs were one of the pet peeves recruiters named in Enhancv's interviews.
• Order: reverse-chronological. Oldest-first ordering was another recruiter complaint.
• Contact details: name, email, phone, city and country, LinkedIn or GitHub, in the body of the page.

A generic "ATS score" without a job ad doesn't tell you much, because what matters is the match with a specific posting. Take one job you actually want and check three things: are its must-have skills in your CV in the same words, does your recent title fit the job title, and does the file parse cleanly?

Our free CV score checker does exactly that with fixed rules (no AI guesswork, the same input always gives the same score): upload your CV, paste a job link or description, and you get a 0–100 match score and the keywords you're missing. Then fix only what's true. Our guide on tailoring your CV without lying shows how.