What is an applicant tracking system?
An applicant tracking system is the software behind the apply button. It publishes the job, receives the application, reads the CV into fields such as job titles, dates and skills, and stores the candidate in a database. Recruiters then use it to move each person through the stages of the process, from new application to offer.
Employers and recruitment firms of every size use them. When you apply online, your CV is usually read by an ATS before it is read by a person.
Does an ATS reject candidates?
Not on its own initiative. An ATS applies the rules it is given: a knockout question on a work permit, a minimum number of years, a required language or keyword. When a profile is filtered out automatically, it is because someone set up that filter. Many systems only rank or tag applications and leave the decision to a recruiter.
What it does badly is read. Multiple columns, text boxes, icons and creative section titles can scramble the extraction, so a relevant profile ends up with empty fields. How to write a CV that survives that step is covered in the Sparagus guide to writing a CV that passes both humans and AI filters.
How is an ATS different from an AI screening tool?
An ATS stores and organises applications. AI screening tools go further: they score, rank or compare candidates against the role, sometimes inside the ATS, sometimes as a separate layer. The line between the two keeps moving as ATS vendors add such features.
The distinction matters legally. The EU AI Act lists AI systems intended to analyse and filter job applications and to evaluate candidates among high-risk systems, which carry specific obligations. A database that only stores applications and applies filters set by a recruiter is a simpler tool, although the boundary depends on what the software actually does.
What rights do candidates have over an ATS?
The rights of the GDPR apply to the data an ATS holds: you can ask what is stored about you, have it corrected and, in many cases, deleted. Under Article 22 of the GDPR, you also have the right not to be subject to a decision based solely on automated processing that significantly affects you, subject to limited exceptions.
In practice, a rejection a few minutes after applying is worth a polite question to the recruiter about how applications are reviewed. The answer often shows whether the problem was the filter, the CV format or the fit with the role. The step that follows the ATS is screening, where the remaining profiles are checked against the role.
