Tech-Forward EOR

Employer of Record API

BOSS is more than an Employer of Record. We’re a technology company with an API you can use to build
white-label payroll, timecards, invoicing, and compliance into your own stack—
tied directly to your ATS, CRM, and accounting.

Request a demo
Learn EOR basics

Launch temp/contract in weeks

ATS + webhooks + accounting

W-2 payroll, COIs, compliance

Why an EOR API matters

Speed to market

Ship a contract program without rebuilding payroll, tax tables, or multi-state rules.

Single source of truth

Placements in your ATS become assignments, timecards, payroll, and invoices—automatically.

White-label UX

Your brand and URLs. BOSS powers the employment layer behind the scenes.

Capital-light growth

As EOR, BOSS handles W-2 payroll, taxes/filings, workers’ comp & COIs, and multi-state compliance.

Automation ready

Events for onboarded, time submitted/approved, payroll run, and invoice posted—no re-typing.

Enterprise controls

Role-based keys, audit logs, least-privilege scopes, and exportable reports.

What you can build with the Employer of Record API

White-label payroll

Create assignments, rates, schedules
Run W-2 payroll via API
View pay history & statements

Timecards & approvals

Web/mobile time entry
OT rules by state, meal/rest logic
Manager approvals & audit trail

Invoicing & billing

Client rate cards & PO support
Consolidated invoices (PDF + lines)
Sync to QuickBooks/NetSuite/Xero

Tie it into your ATS (that’s where the magic is)

Flow

ATS → EOR: Placement becomes Assignment (worker, client, location, rates, schedule).

EOR → ATS: Webhooks for onboarded, first shift, timecard submitted/approved, payroll & invoice posted.

Result: Recruiters update placements once; pay/bill and invoices stay in sync system-wide.

✓ Bullhorn, Greenhouse, Lever, Loxo, Crelate, PCR, custom ATS
✓ Accounting: QuickBooks, NetSuite, Xero, Sage
✓ E-signature, background checks, BI warehouse

{
  "client_id": "CLI-123",
  "worker_id": "WRK-456",
  "assignment": {
    "state": "CA",
    "worksite_zip": "94105",
    "start_date": "2025-09-15",
    "pay_rate": 38.00,
    "bill_rate": 62.00,
    "schedule": "WEEKLY"
  }
}
// POST /assignments -> 201 Created
// POST /timecards -> approvals -> payroll run -> invoice webhook

How it works (implementation sketch)

1. Create or map Client & Worker from your ATS.

2. Create Assignment (rates, schedule, state/location).

3. Launch Onboarding packet (I-9/W-4/state forms).

4. Capture Time (UI or API); apply OT/sick rules.

5. Manager Approves; BOSS runs payroll.

6. Invoice generated & posted to accounting.

7. COI issued; reporting via API.

Security & controls

Scoped API keys
Least-privilege access with per-environment keys.

Audit trails
Track sensitive actions end-to-end.

Encryption
Data encrypted in transit and at rest.

Who uses the EOR API

Staffing firms
Add contract/temp fast; keep your brand and client relationship.

Marketplaces
Offer compliant W-2 engagements for enterprise buyers.

MSP/VMS & roll-ups
Standardize pay/bill, COIs, and reporting across brands.

FAQs

Is this fully white-label?

Yes. Your team and customers stay in your branded experience; BOSS runs Employer-of-Record functions via API.

Do we have to switch ATS?

No. Keep your ATS. We map jobs/candidates/placements to assignments and send status webhooks back.

Can we support multi-state immediately?

Yes. As EOR, BOSS handles payroll, taxes/filings, workers’ comp & COIs, and local labor rules per state so you can start in days.

Next steps

See a live assignment → timecard → invoice run
Get the Employer of Record API reference
Plan your ATS + accounting integration

Book a 15-minute demo
Explore BOSS EOR

Related resources

Prefer a white-label UI kit instead of building screens? Ask about embeddable components.