If you have applied to a mid-sized or large company recently, your CV almost certainly passed through an applicant tracking system before a recruiter opened it. An ATS is the software companies use to receive, store, and sort applications. Knowing which ones are common, and how they behave, takes some of the mystery out of why applications disappear.
This is not a ranking. It is a map of the systems you are likely to meet and what each one means for how you should write your CV.
The systems you will actually encounter
A handful of platforms cover most of the market.
Workday is the one large enterprises use most. If you have ever rebuilt your entire CV into a long web form, field by field, that was probably Workday. It is thorough and slow, and it relies heavily on the structured form rather than the uploaded file.
Greenhouse and Lever are common at tech companies and scale-ups. They tend to have cleaner application flows and lean more on the uploaded CV plus a few questions.
Taleo, now part of Oracle, is an older system still widely used in large traditional organizations. It is the one with a reputation for strict parsing, so a clean format matters most here.
iCIMS, SmartRecruiters, and BambooHR round out the field, the last more common at smaller companies.
You rarely get told which system you are using. But the behaviour is similar enough across all of them that you do not need to. Write for the general case and you are covered.
What every ATS actually does
Under the branding, these systems do the same core jobs:
- Parse your CV into structured data — name, contact details, work history, skills.
- Store it in a searchable database alongside every other applicant.
- Let recruiters search and filter that database, often by keyword, job title, or years of experience.
The myth worth killing is that an ATS "rejects" your CV on its own. In most setups it does not auto-reject. What it does is parse and rank, and a recruiter then searches the pool. If your CV parses badly or lacks the words a recruiter searches for, you are effectively invisible. That is the real failure mode, not a robot pressing decline.
How to write for all of them at once
Because the systems behave similarly, the same habits cover you across the board.
Use a simple, single-column layout. Two-column designs, text boxes, headers and footers, and tables are where parsers stumble. A clean single column reads correctly almost everywhere.
Use standard section headings. "Work Experience," "Education," "Skills." A creative heading like "Where I've Made an Impact" may not be recognized as the experience section, so the content underneath gets misfiled.
Submit a .docx or a text-based PDF. Avoid PDFs exported as images, and never submit a CV as an actual image file. If the parser cannot read the text, none of it counts.
Mirror the job posting's language. If the posting says "project management" and your CV says "managed projects," a keyword search for the exact phrase may miss you. Use the employer's wording where it is genuinely accurate for you.
Fill in the web form properly, even after uploading. With systems like Workday, the structured form is what gets searched. A perfect uploaded CV does not save you if the form fields are half-empty.
What does not help
A few tactics circulate that are not worth your time. White text keyword stuffing, hiding keywords in white-on-white text, is detected and it makes a recruiter distrust the whole application. Cramming every keyword imaginable makes the CV unreadable for the human who eventually sees it, and a human always sees the shortlisted ones. Obsessing over an ATS score from an online tool is mostly noise; those tools do not see the actual system the employer uses.
The honest version works better: a clean format, real keywords that are genuinely yours, and content a recruiter wants to read once it surfaces.
If you are building your CV from a LinkedIn profile, a tool like Postulit produces a clean, single-column, parseable layout by default, which removes the formatting guesswork and lets you focus on matching your content to each job.
The goal is not to beat the ATS. It is to be correctly understood by it, so the human on the other side gets an accurate picture of you.