Complete ATS Integration Guide: Connecting AI Voice Agents to Your HRTech Stack

Why ATS Integration Matters

Your ATS (Applicant Tracking System) is the command center of recruiting. AI interview platforms that don't integrate create data silos, manual re-entry, and workflow nightmares.

Seamless integration means:

• Candidate data flows automatically (no duplicate entry)
• Interview results sync to candidate profiles
• Hiring team sees complete timeline in one place
• Analytics combine ATS + AI interview data

Supported ATS Platforms (2026)

ARIA provides native integrations with:

Tier 1 (Pre-built, one-click):

• Greenhouse
• Lever
• Workday
• iCIMS
• SmartRecruiters

Tier 2 (Configuration required):

• Bullhorn
• JazzHR
• BambooHR
• ADP Workforce Now

Custom:

• Any ATS with REST API via ARIA's open API

Integration Architecture

Data Flow

ATS → ARIA → ATS (complete loop)

(1) New candidate added to ATS
    ↓
(2) Webhook triggers ARIA interview invitation
    ↓
(3) Candidate completes AI interview  
    ↓
(4) Results POST back to ATS candidate record
    ↓
(5) Status updates in both systems

APIs Used

ARIA provides:

• REST API (JSON over HTTPS)
• Webhooks for real-time events
• OAuth 2.0 authentication
• Rate limiting: 1000 requests/hour

ATS must provide:

• Candidate creation/update endpoints
• Custom field support (for AI scores)
• Webhook/event system (optional but recommended)

Step-by-Step: Greenhouse Integration

Prerequisites

• Greenhouse account with API access
• ARIA Enterprise plan
• Admin access to both systems

Step 1: Generate API Keys

In Greenhouse:

1. Navigate to Settings → API Credentials
2. Create new API key with permissions:
   • candidates:read
   • candidates:write
   • applications:read
3. Copy API key (shown once)

In ARIA:

1. Dashboard → Integrations → Greenhouse
2. Click "Connect Greenhouse"
3. Paste Greenhouse API key
4. Click "Authorize"

Step 2: Configure Interview Triggers

When should ARIA invite candidates?

Option A: Stage-based triggering

• Trigger when candidate reaches "Phone Screen" stage
• ARIA auto-invites within 5 minutes

Option B: Manual invitation

• Recruiters click "Send AI Interview" button in Greenhouse
• ARIA sends invitation immediately

Option C: Application-based

• Every new application automatically gets AI interview
• Used for high-volume roles

Configuration:

1. ARIA Dashboard → Greenhouse Settings
2. Select trigger type
3. Map Greenhouse stages to ARIA interview types

Step 3: Field Mapping

Data to sync Greenhouse → ARIA:

• Candidate name
• Email
• Phone
• Resume/CV URL
• Job title applied for
• Application date

Data to sync ARIA → Greenhouse:

• Interview completion status
• AI-generated score (1-10)
• Transcript URL
• Recommendation (Advance/Maybe/Pass)
• Audio recording URL

Custom fields in Greenhouse:

Create these fields to receive ARIA data:

• aria_interview_score (numeric, 0-10)
• aria_interview_status (dropdown: Pending, Completed, No-show)
• aria_transcript_url (URL)
• aria_recommendation (dropdown: Advance, Maybe, Pass)

Step 4: Test Integration

Test checklist:

• Add test candidate in Greenhouse
• Verify ARIA invitation sent
• Complete test interview
• Confirm score appears in Greenhouse candidate record
• Check transcript link works
• Verify status updates in both systems

Step 5: Go Live

• Enable for one job requisition first
• Monitor for 1 week
• Train recruiters on new workflow
• Scale to all appropriate roles

Workday Integration

Workday's API is more complex. Key differences:

Authentication: SAML + OAuth (not simple API key)

Data Model: Workday uses Workers, not Candidates

Setup Time: 2-4 weeks vs hours for Greenhouse

Recommended: Work with ARIA's integration team for Workday

Lever Integration

Lever integration is streamlined:

Webhook-based:

1. Configure webhook in Lever:

   • URL: https://api.ariahr.ai/webhooks/lever
   • Events: candidate_stage_change

2. ARIA listens for candidates entering "AI Interview" stage

3. Invitation sent automatically

4. Results POST back to Lever custom fields

Setup time: ~30 minutes

Custom API Integration

For ATS not on the pre-built list:

ARIA Public API

Base URL: https://api.ariahr.ai/v1

Authentication:

Authorization: Bearer YOUR_API_KEY

Key Endpoints:

Create Interview Invitation

POST /interviews
Content-Type: application/json

{
  "candidate": {
    "email": "jane.doe@example.com",
    "name": "Jane Doe",
    "phone": "+15551234567"
  },
  "job_id": "job_abc123",
  "interview_kit_id": "kit_xyz789",
  "send_immediately": true
}

Response:

{
  "interview_id": "int_456def",
  "invitation_link": "https://interview.ariahr.ai/start/int_456def",
  "status": "invited",
  "expires_at": "2026-01-08T00:00:00Z"
}

Retrieve Interview Results

GET /interviews/{interview_id}

Response:

{
  "interview_id": "int_456def",
  "status": "completed",
  "score": 8.5,
  "recommendation": "advance",
  "transcript_url": "https://transcripts.ariahr.ai/int_456def.pdf",
  "recording_url": "https://recordings.ariahr.ai/int_456def.mp3",
  "completed_at": "2026-01-05T14:30:00Z",
  "insights": {
    "communication_score": 9,
    "technical_score": 8,
    "cultural_fit_score": 8  
  }
}

Webhooks

Subscribe to events:

Events available:

• interview.invited
• interview.started
• interview.completed
• interview.no_show

Webhook payload example:

{
  "event": "interview.completed",
  "interview_id": "int_456def",
  "timestamp": "2026-01-05T14:30:05Z",
  "data": {
    "score": 8.5,
    "recommendation": "advance",
    "transcript_url": "...",
    "recording_url": "..."
  }
}

Webhook security:

• HMAC-SHA256 signature in X-ARIA-Signature header
• Verify signature to prevent spoofing

Troubleshooting Common Issues

Issue 1: Invitations Not Sending

Symptoms: Candidate added to ATS, no ARIA email received

Causes:

• Webhook not configured
• Email in spam folder
• Invalid email format

Fix:

• Check webhook configuration
• Whitelist @ariahr.ai domain
• Verify email format matches RFC 5322

Issue 2: Scores Not Syncing Back

Symptoms: Interview completed, data doesn't appear in ATS

Causes:

• Missing custom fields in ATS
• API permission issues
• Field mapping incorrect

Fix:

• Create required custom fields
• Verify API key has write permissions
• Re-map fields in ARIA settings

Issue 3: Duplicate Candidates

Symptoms: Same candidate appears twice in ATS

Causes:

• Email mismatch (john@gmail.com vs john+aria@gmail.com)
• Deduplication logic not enabled

Fix:

• Use canonical email in both systems
• Enable "merge duplicates" in ATS settings

Security Best Practices

1. API Key Management

• Use separate keys for dev/staging/production
• Rotate keys quarterly
• Never commit keys to git

2. Data Encryption

• All API calls over HTTPS (TLS 1.3)
• Candidate PII encrypted at rest
• GDPR/CCPA compliant data handling

3. Access Control

• Limit API key permissions to minimum required
• Audit API usage monthly
• Implement IP whitelisting if possible

Performance Optimization

Rate Limiting:

• ARIA allows 1000 API calls/hour
• Batch requests when possible
• Use webhooks instead of polling

Caching:

• Cache candidate data for 5 minutes
• Reduces API calls by 60%

Async Processing:

• Don't wait for ARIA responses in user-facing workflows
• Use background jobs for syncing

Support & Resources

Documentation:

• Full API docs: developers.ariahr.ai
• Postman collection: github.com/ariahr/api-examples

Support Channels:

• Technical support: integrations@ariahr.ai
• Slack community: ariahr-developers.slack.com
• Office hours: Tuesdays 2-3pm ET

SLA:

• Response time: <4 hours for Enterprise customers
• Uptime: 99.9% guaranteed

Conclusion

ATS integration transforms ARIA from a standalone tool into a seamless part of your hiring workflow. The investment (30 min to 2 weeks depending on ATS) pays off in:

• Eliminated manual data entry
• Single source of truth for candidate data
• Better recruiter adoption
• Comprehensive analytics

Ready to integrate?

View Integration docs →

Or contact our integration team → for hands-on setup assistance.

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