What is an ATS?
An applicant tracking system (ATS) is the software employers use to collect, store and filter job applications. Greenhouse, Lever, Ashby and Workday are common ones.
Many read your CV as plain text before a person sees it, so structure and wording matter. ATSJudo writes for that first read: one column, standard headings, and the posting's own terms wherever your experience supports them.
More: what an applicant tracking system does with your CV and how to make a CV ATS-friendly.