An ATS, or applicant tracking system, is software that manages the hiring process, from posting jobs and collecting applications to screening candidates, scheduling interviews, and sending offers. It keeps every candidate's history in one place and gives recruiters and hiring managers a shared view of the pipeline.
Key takeaways
- An ATS posts jobs to career sites and job boards and collects applications in one database.
- It moves candidates through stages and tracks feedback, scorecards, and communications.
- Most ATS tools integrate with HRIS or onboarding so hires flow straight into the employee record.
- Knockout questions and AI screening should be checked for disparate impact.
How ATS works
The recruiter opens a requisition, gets approval, and publishes the job to the career site and job boards. Applications land in the ATS, which parses resumes into searchable profiles. Recruiters screen, move candidates to stages such as phone screen, interview, and offer, and the system sends emails and schedules interviews.
Hiring managers see candidates and submit structured feedback in scorecards. When a candidate accepts, the ATS generates the offer letter, triggers background checks, and passes data to onboarding and the HRIS. It also stores voluntary EEO self-identification data separately for reporting.
Many ATS products now add AI features, such as candidate matching, interview summaries, or automated outreach. They can save time but need oversight for accuracy and fairness.
ATS example
A 200-person company hires 60 people a year using email and spreadsheets. Candidates wait days for replies, and managers lose resumes. After adopting an ATS, every application lands in one pipeline, interview requests go out automatically, and managers complete scorecards on their phones. Time-to-fill drops from 52 days to 38, close to SHRM's 39-day median for nonexecutive roles (SHRM 2026 recruiting benchmarking data).
Why ATS matters for employers
Hiring is slow and expensive when it runs on inboxes. SHRM's 2026 benchmarking shows nonexecutive roles take a median 39 days to fill, and 97% of nonexecutive positions are filled externally (SHRM 2026 recruiting benchmarking data). An ATS shortens that cycle and improves candidate experience, which affects your employer brand.
It also creates a compliance record: who applied, who advanced, and why. That matters if hiring decisions are ever questioned. Compare tools in our applicant tracking software guide and Greenhouse alternatives.
Common ATS mistakes to avoid
Overusing knockout questions
Rigid filters can exclude qualified people and create disparate impact.
Leaving candidates without updates
Automate stage emails so no one waits in silence.
Unstructured feedback
Use scorecards tied to job requirements, not free-text impressions.
Not connecting to onboarding
Re-keying new hire data wastes time and causes errors.
ATS: questions people also ask
What does an ATS do?
Do ATS systems reject resumes automatically?
Who uses an ATS?
What is the difference between an ATS and a recruiting CRM?
How much does an ATS cost?
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HRTally glossary entries are written by people who have run US payroll, benefits, and HR operations, then checked line by line against primary sources such as the IRS, Department of Labor, EEOC, and Bureau of Labor Statistics. Dollar limits and rates are for 2026 unless stated. We review every entry at least twice a year and whenever a rule changes. This page explains general rules and isn't legal or tax advice; state law can differ. Read our editorial standards.
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<blockquote>An ATS, or applicant tracking system, is software that manages the hiring process, from posting jobs and collecting applications to screening candidates, scheduling interviews, and sending offers. It keeps every candidate's history in one place and gives recruiters and hiring managers a shared view of the pipeline.</blockquote><p>Source: <a href="https://www.hrtally.com/hr-glossary/ats/">HRTally HR Glossary, ATS</a></p>
Written by the HRTally Research Team
Our guides are written and reviewed by people with hands-on US HR, payroll, and HR technology experience. Legal and tax facts are checked against primary sources, such as the Department of Labor, IRS, EEOC, and USCIS, and linked at the end of each guide. Vendors never review or pay for our editorial content.