ex-Employee information updated after using external career site without validation

Summary

Does anybody have any ideas or experience on how to manage ex-employee updates to personal info when they re-apply?

Content

Hello community,

I would like to know if I can get some recommendations or ideas on how to control when an ex-employee applies to a job and makes updates to personal information like address, email, telephone or even first/last name.  Perhaps using an approval workflow? or using an email notification?

Thanks.

Version

20D