Employee onboarding and Form I-9
Check the documents new hires present for Form I-9 before day one
List A, B and C documents read, checked for expiry and matched to the new hire.
The problem
- New hires upload a mix of passports, green cards, driver licenses and Social Security cards.
- Expired documents and name mismatches show up late, while completing Section 2.
- Copies of identity documents end up in email threads and shared drives.
With Constaia
- One expect with the List A and List B types: the verdict says which document it is and whether it is unexpired on the start date.
- Names checked against your HR record, with flexible order of names and accents.
- Unrestricted Social Security cards (List C) read with the SSN structure rules; restrictive legends are flagged.
- Zero retention by default. Constaia helps you check the documents employees present; it does not replace the employer's Form I-9 obligations, the document examination the rules require, or E-Verify.
Typical documents
Sample request
curl https://api.constaia.com/v1/analyze \
-H "Authorization: Bearer $CONSTAIA_API_KEY" \
-F "file=@document.pdf" \
-F 'options={
"expect": [
"passport",
"us_passport_card",
"us_permanent_resident_card",
"us_driver_license",
"us_state_id"
],
"checks": {
"not_expired": true,
"reference_date": "2026-10-05",
"holder": {
"full_name": "Jordan Specimen"
}
},
"storage": "none"
}'And for the record…
Create your account, copy the test key and validate your first document in five minutes.