When companies hire new employees, they are tasked with completing Form I-9 Employment Eligibility Verification.

Employees, when hired - have to attest their employment authorization and also present
their employer with substantial and acceptable documents
proving identity and
employment authorization.

Within the I-9 verification process, the employer will be able to assess the employment credentials, eligibility, and identity documents presented by the applicant then determine the legitimacy of the documents and record all necessary information on the I-9 Form.
This form must be completed and filed for each worker hired, regardless of whether the person is a U.S. citizen or a non-citizen.
But what if you're hiring remotely? Or perhaps hiring someone from a different state or country? How will you complete the I9 Form?
OUTSOURCING
The I9 Form is one that has specific timeframes to adhere to or risk penalties of $110-$1,100 per violation. This is fairly easy for employers to manage when the employee hired is working on site. But what does a company do when the employee is working remotely?
Outsourcing companies remotely hiring would seek the services of an Authorized I9 Representative - in this case, a Notary Public - to verify the identity documents and complete the information on behalf of the applicant.
REMOTE HIRING
Since the pandemic, private-owned and in-house human resource managers have faced the challenge of hiring and employing remotely.
Some businesses never stopped operating and today, most companies have slowly been able to operate - however, travel and work restrictions vary depending on your state and country - and so most HR Managers seek the services of a Notary Public to perform I9 Verifications on their behalf of the applicant.

Source