What is ATS? How Applicant Tracking Systems Work

You submit a job application, and then... nothing. No acknowledgement, no rejection, no explanation. It happens so often that most job seekers assume the recruiter just didn't like their resume - but often your resume never reached a human at all.

Between you and the hiring manager sits a piece of software called an Applicant Tracking System (ATS). It processes your resume before any person sees it, and it determines whether you make the cut. Understanding how it works is the first step to getting past it.

In this guide you'll learn exactly what ATS is, how it reads your resume, what it's looking for, and how to format your resume to pass it reliably.

What is ATS?

An Applicant Tracking System is software that companies use to manage job applications. When you apply online - through a company's careers page, LinkedIn, Indeed, or any similar platform - your resume almost certainly goes into an ATS first.

The system does several things automatically:

• Parses your resume into structured data (name, contact info, skills, work history, education)
• Scores your resume against the job description based on keyword matching and other criteria
• Ranks your application relative to other candidates
• Routes applications to the right recruiter or hiring manager

The most widely used ATS platforms include Workday, Greenhouse, Lever, Taleo, iCIMS, and BambooHR. At large companies, the recruiter often only sees applications that cleared a minimum ATS score threshold - which means a perfectly qualified candidate with a poorly formatted resume can be invisible.

How ATS Actually Reads Your Resume

When you upload a PDF or Word document, the ATS attempts to parse it into structured fields. This is where most resume formatting problems occur. The system is reading raw text - and complex formatting confuses it.

What ATS parses well

• Clean text in standard fonts (no icons, no text in image form)
• Standard section headings (Work Experience, Education, Skills)
• Dates in consistent formats (Jan 2022 - Mar 2024)
• Single-column layouts without tables or text boxes
• Standard file formats: PDF and .docx

What ATS struggles with

• Multi-column layouts - parsed left-to-right across columns, jumbling your content into nonsense
• Headers and footers - often ignored entirely or misread
• Text in images or graphics - completely invisible to the parser
• Tables - cell content is often merged or scrambled
• Unusual section headings - "Where I've Been" instead of "Work Experience" may not be recognised
• Fancy fonts and special characters - may render as symbols or be stripped out

The practical implication: a beautifully designed resume with two columns and custom icons may score lower in ATS than a plain, single-column document with better keywords. The recruiter who eventually reads it will never see the formatting - they see the parsed version.

What ATS Is Actually Scoring

ATS scoring varies by system, but most evaluate some combination of:

1. Keyword matching

The system compares the words in your resume to the words in the job description. Required skills, tools, job titles, and certifications are typically weighted highest. If the job description says "SQL" and your resume says "database querying," you may score zero for that requirement - even though they mean the same thing.

This is why mirroring the exact language from the job description matters so much. Not paraphrasing it - using the exact terms the employer chose.

2. Experience and tenure

Some systems look for years of experience for specific skills. If a role requires "5+ years of Python" and your Python experience isn't dated clearly or appears in a confusingly formatted section, the system may undercount it.

3. Education requirements

Degree level and field are often parsed and scored. A role requiring a "Bachelor's degree in Computer Science" may automatically filter out anyone whose degree field doesn't match - even if their experience is equivalent. Check what the posting actually requires versus prefers.

4. Proximity of keywords

More sophisticated systems look at context, not just keyword presence. "Managed SQL databases for a 10-person team" scores better than "SQL" isolated in a skills list, because the context signals genuine experience rather than a keyword-stuffed skills section.

How to Format Your Resume to Pass ATS

The good news: ATS-friendly formatting is also cleaner and easier to read for humans. You're not sacrificing aesthetics for technology - you're just removing the things that were never useful in the first place.

Use a single-column layout

No two-column resume designs. Full-width, top-to-bottom content only. The occasional table or side element for skills is generally fine, but keep your main content - work history, summary, education - in a single column.

Use standard section headings

Stick to: Work Experience (or Professional Experience), Education, Skills, Summary (or Professional Summary), Certifications. Don't get creative with headings. The ATS is pattern-matching against a library of expected labels.

Include keywords from the job description

Read the job description carefully and identify the top 10-15 skills, tools, and qualifications they mention. Make sure every one that applies to your background appears in your resume - preferably in context (inside a bullet point) not just in a skills list.

Use readable fonts and simple formatting

Calibri, Arial, Georgia, or Times New Roman at 10-12pt. Bold for headings. No text boxes, no icons in place of text, no photos. Save the stylish design for creative industries where it's expected and appropriate - and even then, have a second ATS-clean version ready.

Save as PDF (usually)

Most modern ATS handles PDF well. If a job posting specifically asks for .docx, use that. When in doubt, PDF is the safer default because it preserves formatting consistently regardless of what software opens it.

Common ATS Myths Debunked

Myth: White keyword stuffing fools ATS

This was true in 2012. Modern ATS detect it. Worse, when a human eventually reads the parsed resume, hidden text often surfaces as garbled characters. Don't do it.

Myth: ATS rejects all creative resumes

ATS struggles with complex formatting, not creativity in content. A cleanly formatted resume with compelling, specific bullet points is both ATS-friendly and genuinely interesting to read. The design isn't what makes a resume stand out - the content is.

Myth: Once ATS rejects you, you can never reapply

Most ATS store your profile, not a permanent ban. If a role reopens or a similar role appears, you can reapply with an improved resume. Some companies have a waiting period (often 6-12 months) for the same role, but nothing prevents you from applying to other openings.

Myth: Smaller companies don't use ATS

Increasingly they do. Even 20-person startups use Greenhouse or Lever because the free or low-cost tiers are genuinely useful for managing applicants. Never assume a manual review just because the company is small.

Frequently Asked Questions

What percentage of resumes are filtered by ATS before a human sees them?

Estimates vary, but research from Jobscan and similar sources suggests 75% or more of resumes at large companies are filtered or deprioritised by ATS before reaching a recruiter. At companies receiving hundreds of applications per role, the threshold is necessarily high.

Does a high ATS score guarantee an interview?

No. ATS score determines whether your resume reaches a human - the human then decides whether to interview you. A high ATS score gets you in front of someone; your resume's content and your cover letter determine what happens next.

Can I see my ATS score for a job I applied to?

Not directly. The company's ATS is internal. But you can use tools like LumiCV to analyse how well your resume matches the job description before you submit - effectively simulating what the ATS will find. This lets you fill gaps before your application is ever processed.

Should I use a different resume for every job?

Yes - a tailored version, at minimum. Keep a comprehensive "master" resume and create a tailored version for each application. The tailoring process is mostly about keyword matching and bullet point ordering, which can be done quickly with the right tool. Sending the same resume everywhere is the single most common reason qualified candidates get no responses.

Are LinkedIn applications processed by ATS?

Yes. When you apply via LinkedIn Easy Apply, your application data is typically sent directly to the employer's ATS. If you upload a resume, it's parsed and scored. Your LinkedIn profile may also be imported as supplemental data in some systems.