Justworks PEO & HR API
Justworks REST API for professional employer organization (PEO) and HR platform for small and mid-size businesses. Enables AI agents to manage employee record and profile data synchronization for HR system integration, handle payroll run data retrieval and compensation management queries, access benefits enrollment and plan data for benefits administration automation, retrieve time and attendance data for payroll processing integration, manage contractor and vendor payment data for financial reconciliation, handle compliance and tax document access for reporting automation, access company and location hierarchy data for organizational management, retrieve employee lifecycle event data for HRIS integration, manage team reporting and org chart data extraction, and integrate PEO and HR data with HRIS, accounting, and workforce management platforms.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
PEO HR data. SOC2, HIPAA, GDPR. OAuth2. US. Employee PII and compensation data.
⚡ Reliability
Best When
A small or mid-size business using Justworks PEO wants AI agents to automate employee data synchronization, payroll data retrieval, benefits management, and HR reporting integration.
Avoid When
COMPLIANCE RISK: PEO employee data contains highly sensitive PII including SSNs, compensation, and benefits — automated access requires strict access controls and audit logging. Payroll data modifications require human approval; automated payroll changes can cause incorrect employee compensation. Co-employment legal structure creates shared liability; verify compliance requirements with HR counsel.
Use Cases
- • Syncing employee data to HRIS from HR automation agents
- • Retrieving payroll data for financial reconciliation agents
- • Accessing benefits enrollment data from benefits administration agents
- • Integrating headcount data with workforce planning agents
Not For
- • Large enterprise HR without SMB and PEO co-employment model
- • Global payroll without US-focused PEO employment model
- • HR analytics without co-employment and benefits administration context
Interface
Authentication
Justworks uses OAuth 2.0 with scoped access tokens. Developer portal at developer.justworks.com. Webhooks for real-time HR event notifications. REST API with JSON responses. Access scopes for read-only vs. read-write operations. US PEO model only. HR partner integrations via OAuth for HRIS and productivity tools.
Pricing
New York City, New York. Founded 2012. Public company (JW, NYSE). PEO market for SMBs. 12,000+ customers. Co-employment model: Justworks is employer of record. Benefits purchasing power for SMBs. Strong in tech startup market. Competes with Gusto and TriNet for SMB PEO market.
Agent Metadata
Known Gotchas
- ⚠ COMPLIANCE RISK: PEO employee data contains SSNs, compensation, and benefits PII — automated access requires strict RBAC and audit logging; HIPAA BAA required for benefits data
- ⚠ Co-employment model — Justworks acts as employer of record; API data reflects co-employment structure; understand dual employer relationship before automating HR workflows
- ⚠ US PEO only — Justworks is a US PEO; no international employee data; global workforce requires separate international payroll solution
- ⚠ Payroll approval required — payroll data modifications require human approval workflow; automated payroll changes without approval cause compensation errors
- ⚠ Webhooks for HR events — use webhooks for real-time employee onboarding, offboarding, and benefits change events rather than polling
- ⚠ Integration partner program — production API access requires Justworks integration partner approval; not open to any customer-built integration
Alternatives
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Scores are editorial opinions as of 2026-03-07.