By the Connecting Odds Editorial Team
The short version - An ATS parses your resume, matches keywords against the job posting, and ranks you. It doesn't read like a human. - Send a text-based PDF or .docx, use standard headings, keep contact info in the body. - Mirror the posting's exact language, and put skills inside work bullets. - Quantify results with numbers and scale. - Check your score before you apply. Three free checks a day.
Most resumes never reach a human. Before a recruiter sees your application, an applicant tracking system (ATS) — Workday, Greenhouse, Lever, iCIMS, Taleo, or SmartRecruiters — parses your resume, extracts the text, and ranks it against the job description. Here's how to make sure yours survives.
What an ATS actually does
An ATS does three things: (1) extracts text from your file, (2) matches keywords and skills against the job posting, (3) ranks candidates for the recruiter. It doesn't "read" your resume like a person — it pattern-matches. Resumes fail most often at step 1 (unreadable formatting) or step 2 (missing keywords).
1. Use formatting the parser can read
| Do this | Not this |
|---|---|
| Text-based PDF or .docx | Scanned images, ancient .doc files |
| Contact info in the body | Contact info in the header or footer (parsers often skip them) |
| Standard headings: Experience, Education, Skills, Summary | Creative headings like "My Journey" |
| Single-column layout | Text boxes, tables, multi-column designs |
2. Mirror the posting's language
The single highest-weight factor is keyword match. If the posting says "Kubernetes" 6 times and your resume says "k8s" once in a skills list, you lose points. Use the posting's exact terms, and put skills inside work bullets — a skill demonstrated in context counts more than one sitting in a skills list.
3. Use the job title recruiters search for
Recruiters search by title. If the role is "Senior Backend Engineer" and your resume says "Software Ninja III", the title match fails. Use the standard title; keep your flair for the interview.
4. Quantify everything
Bullets with numbers, percentages, and scale ("cut deploy time 40%", "led team of 6", "handled $2M budget") score higher and read better to humans. Weak verbs and clichés ("synergy", "team player", "responsible for") score lower.
5. Check your score before you apply
Guessing is the expensive option. Run your resume against the actual posting with a free ATS resume checker — we built one at Connecting Odds that scores you out of 100 across nine areas (keyword match, title, requirements fit, measurable results, formatting, sections, searchability, language, length), shows exactly what each check is worth, and lets you tailor and re-score before you hit apply. Three checks a day are free.
What an ATS score can't do
No score guarantees an interview. A 90/100 resume for a role you're unqualified for still loses to a 70/100 from someone who's done the job for five years. The score improves your odds of being found and shortlisted — it doesn't replace fit.
Frequently asked questions
Will the ATS reject my resume automatically? Most systems rank rather than auto-reject, but recruiters rarely scroll past the top 20–30 matches. Being ranked #200 is effectively rejected.
Do I need a different resume for every job? Tailor the top third (summary, skills, latest bullets) to each posting's keywords. A full rewrite each time is overkill; a targeted tune-up takes ten minutes with a checker.
Is it cheating to mirror the posting's keywords? No — as long as every keyword you use is true. Never add skills, degrees, or numbers you don't have. Dishonest keywords surface in the interview and end the process.
PDF or Word? Either, as long as it's text-based. Text-based PDF and .docx both parse reliably. Avoid scanned images and ancient .doc files.
Keep going: run your resume through our free ATS resume checker before your next application, and check salary data for your role so you know what to ask for.