What Is an Applicant Tracking System (ATS)?

An Applicant Tracking System (ATS) is software used by employers to manage the entire hiring process — from receiving applications to tracking candidates through interviews and offers.

Its most relevant function for job seekers is resume parsing and search: the ATS parses each resume into structured data, and recruiters can then search, filter, and rank applicants against the job description. Some employers also add knockout questions or filters, such as a required certification, that can set aside applications that don't meet a minimum requirement.

How ATS Works in Practice

  1. A company posts a job and the ATS collects all incoming applications.
  2. Each resume is parsed — broken down into structured fields like work experience, education, and skills.
  3. The ATS compares your resume's content against the job description using keyword matching.
  4. Depending on the system and the employer's setup, candidates can be searched or ranked by how well they match. Recruiters often start with the strongest matches. Third-party checkers estimate this with an ATS score.

For a plain-language walkthrough, see how an ATS reads your resume.

Who Uses an ATS?

  • Large employers commonly use an ATS, and so do many smaller ones.
  • Popular ATS platforms include Workday, Greenhouse, Lever, Taleo, iCIMS, and BambooHR.

Why It Matters for Job Seekers

A resume that looks polished to a human can still parse or match poorly in an ATS if it uses:

  • Tables or multi-column layouts that break text extraction
  • Images, icons, or infographic elements
  • Non-standard section headings
  • Language that doesn't match the job description's exact phrasing

Understanding the ATS is the first step to getting your resume in front of a real person.

How ReframeCV Helps

See how your resume holds up: check your resume score for free — no signup needed. The score is ReframeCV's own estimate, not an employer's ATS result. ReframeCV also uses a Job-First Approach: paste the job description, and the AI identifies the keywords and requirements in the posting — then builds your resume around them automatically.