The Employee module is project specific, so there is no global list of employees.
The original idea for creating it project specific was, that there are large projects with many subcontractors, and subcontractor employees are usually working for one project. Thus a global list would be bloatet with many subcontractors only working on one site.
Over the years we have received frequent feedback that this is an issue for managing internal employees, who are working on many Insite LMS projects.
Thus the request would be to convert the Project Employees to Global Employees, allowing one central management of employees and it's certificates.
The downside may be, that this is a large list if you are working with many subcontractors.
A Global/Project Employee setup may look similar to Global/Project Tool modules.