How Do ATS Systems Work?

Applicant Tracking Systems (ATS) are software tools designed to help companies manage and streamline their hiring process. They allow recruiters to quickly sort, filter, and rank resumes, especially when hundreds or thousands of applications are submitted for a single role. Understanding how ATS works is crucial for job seekers who want their resumes to pass automated screenings and reach a human recruiter.

Resume Parsing

The first step an ATS takes is parsing your resume. This means the system reads your document and extracts key information to create a structured profile. Data is pulled from headers, bullet points, and sections of your resume:

Contact details: name, phone number, email
Work experience: job titles, company names, and employment dates
Education: degrees, schools, and graduation dates
Skills, certifications, and relevant keywords

Complex formats like tables, images, or unusual fonts can confuse ATS systems. Keeping your resume simple and structured improves parsing accuracy.

Keyword Matching

Once your resume is parsed, the ATS scans it for keywords and phrases that match the job description. Keywords can include skills, certifications, software tools, and industry-specific terminology:

Skills listed directly in the job posting
Relevant certifications or licenses
Industry jargon or specific technologies

Using variations of keywords (for example, “JavaScript” vs. “JS”) can help capture more matches. Tailoring your resume to each job increases the likelihood of passing ATS filters.

Scoring and Ranking

After identifying keywords, the ATS scores and ranks resumes. The scoring is based on how closely your experience, skills, and qualifications align with the job requirements. Resumes with higher scores are more likely to be reviewed by human recruiters:

Relevance of skills to the job posting
Years of experience in key areas
Proper formatting and clear headings

Resume Formatting Matters

Formatting can make or break your ATS success. Many systems struggle to read resumes with complex layouts, graphics, or unconventional fonts. Stick to a simple, clean layout to ensure your information is captured correctly:

Use standard fonts like Arial, Calibri, or Times New Roman
Avoid images, charts, or graphics for key information
Use clear headings such as “Work Experience” and “Education”
Keep bullet points short and structured

Human Review

Once the ATS ranks resumes, recruiters manually review the top candidates. This means your resume must not only pass automated screening but also appeal to a human reader. Highlight achievements, use action verbs, and maintain clarity to make a strong impression.

Common Mistakes That Reduce ATS Compatibility

Using headers and footers for contact information (ATS may skip it)
Embedding text inside images or PDFs that are not ATS-friendly
Overusing graphics, tables, or columns
Omitting essential keywords from the job description