CV Once

What an applicant tracking system (ATS) actually does

An ATS is a database and workflow tool for recruiters, not a robot that secretly bins most CVs.

An applicant tracking system (ATS) is the software an employer uses to manage job applications. If you have ever applied through a careers page that asked you to upload a CV and then fill in a form, you have used one. Widely used examples include Workday, iCIMS, Greenhouse, Lever and Oracle’s Taleo, and many smaller recruitment tools do the same job.

There is a lot of fear and some bad advice about these systems. This guide explains what they actually do, which claims about them are myths, and what that means for how you write your CV.

What an ATS does

1. Stores applications

At its simplest, an ATS is a database. Every application for every job goes into one place, with your CV, any cover letter, your answers to the application form and your contact details. Recruiters use it instead of an email inbox full of attachments. Many also keep your record for future vacancies, subject to data protection law and the employer’s retention policy.

2. Parses your CV into fields

When you upload a CV, the ATS usually tries to parse it: read the text and split it into structured fields such as name, email, phone, job titles, employers, dates, education and skills. That is why many application forms pre-fill after you upload a CV, often with a few mistakes you then correct.

Parsing is where layout matters. The parser reads the text in your file, in the order it is stored, and guesses which bits are which. Simple, single-column documents with standard headings parse well. Complex layouts can come out scrambled: dates attached to the wrong job, contact details missing, columns interleaved line by line. See ATS formatting pitfalls for the specific problems and how to test for them.

3. Lets recruiters search and filter

Recruiters can search across applicants for a job, or across the whole database, for words and phrases: a skill, a qualification, a job title, a location. They can filter by answers to application questions and sort by date or status. If a recruiter searches for “CIPD Level 5” and your CV says “CIPD Level 5”, you show up. If it says “HR qualification”, you may not.

This is the real reason keywords matter: not because a machine scores you, but because a person searches with the words they expect to see. See job ad keywords.

4. Asks knockout questions

Many application forms include screening questions with required answers, often called knockout questions. Typical examples:

  • Do you have the right to work in this country?
  • Do you hold a full driving licence?
  • Are you registered with the relevant professional body?
  • Can you work weekends?

If you give an answer that does not meet a requirement the employer set, the system may reject or deprioritise your application automatically. This is one of the few genuinely automatic rejections, and it is based on your form answers, not your CV design.

Watch out: Answer knockout questions accurately and read them carefully. A misread question can end an application before anyone opens your CV.

5. Manages the workflow

Moving candidates between stages (applied, screened, interview, offer), scheduling interviews, sending template emails, collecting interviewer feedback and producing reports. Much of what a candidate experiences as “the system” (automated acknowledgements, rejection emails) comes from this part.

6. Sometimes ranks or matches

Some systems offer features that score or rank applicants against the job description, and newer products increasingly add automated matching. Whether an employer turns these on, and how much weight recruiters give them, varies a great deal and is not visible to you as a candidate. The practical advice does not change: clear structure, accurate wording that matches the job, and real evidence.

Myths

“75% of CVs are rejected by ATS before a human sees them”

This figure is quoted all over the internet, often by people selling CV services. It has no credible source: no published study or survey supports it. It also misunderstands how most systems work. Most ATS software does not decide; it stores, parses and filters, and people make the decisions.

“Recruiters spend 6 seconds on a CV”

Not an ATS claim, but often quoted alongside one. It comes from a 2012 eye-tracking study by TheLadders, a job site, using a small group of recruiters. It is an industry study, not a general rule. The sensible takeaway is modest: make the important information easy to find.

“You must use a special ATS template”

No particular template is required. A clean, single-column layout with standard headings and real text is what parsers handle best. “ATS-friendly” is not a certification.

“PDFs can’t be read by an ATS”

Most modern systems read text-based PDFs without trouble. The problem is PDFs where the text is actually an image (scans, or exports from some design tools). If an employer asks for a Word document, send one. Otherwise a text-based PDF is usually fine.

“Hidden white text will get you through”

Pasting the job ad in white text is easy to spot (it appears in the parsed text and in any plain-text view) and can make you look dishonest. Don’t.

So who rejects CVs?

In most hiring processes, a person does. A recruiter or hiring manager reads, or skims, the CVs that match their search and filters, and decides who goes forward. The ATS affects whether your CV is found and how readable it is once parsed. A person decides whether you are a good fit.

That suggests two jobs for your CV:

  1. Be parseable and findable: simple structure, standard headings, the job’s key terms in your own accurate words.
  2. Be convincing to a human: specific achievements, numbers, relevance. See the achievement bullets guide.

What this means in practice

  • Use a single-column layout with standard section headings such as “Work experience”, “Education”, “Skills”. The builder flags headings an ATS may not recognise.
  • Keep contact details in the body of the document, not in a header or footer, and as text rather than icons.
  • Use the same terms the job ad uses for skills and qualifications you really have.
  • Fill in application forms fully, even if it repeats your CV.
  • For job portals that ask you to paste your CV, use a plain-text version. The builder exports one.

Tip: The Clarity template is a single-column layout with standard headings, the safest choice for parsing. Two-column templates such as Sidebar look good and parse well in many modern systems, but are a slightly bigger risk on older ones.

Next: check your file with the ATS formatting pitfalls guide, including a two-minute copy-and-paste test.