An “Expiration Reminder ATS” would likely refer to a feature within an applicant tracking system (ATS) that reminds users when certain information or documents, such as certifications or licenses, are set to expire. This feature is designed to help companies stay compliant with regulations and ensure that their employees have the necessary credentials to perform their jobs. It may also send out reminders to employees prior to the expiry date to renew their required documents. This feature will help companies to keep track of expiration dates of important documents, avoid penalties and fines and maintain a good compliance record.