To connect an applicant tracking system (ATS) to a recruiting automation platform, first check for a native integration that supports the records and actions you need. If there isn’t one, consider a no-code connector, middleware, or a custom API and webhook integration. Before setup, decide which system owns each field, which events should trigger workflows, and how you’ll authorize, test, secure, and monitor the connection. The exact steps depend on the two products; Greenhouse examples below illustrate options, not universal instructions.
Choose what the connection should do
“Connect” does not necessarily mean that every candidate record or field will synchronize. Start by naming both products and writing down the workflow you want to automate.
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- Records: Which data needs to move—for example, candidates, applications, prospects, job details, or status updates?
- Trigger and action: What event should start the workflow, and what should the other system do in response?
- Direction: Does data move from the ATS to the automation platform, in the opposite direction, or both?
- Ownership: Which system is authoritative for each field, and what should happen when the same field changes in both?
Set rules for duplicates and updates before enabling a live workflow. Check that both products support the objects, triggers, and actions you need; a connector may cover only part of your process.
Compare the available connection routes
| Route | When it may fit | What to check |
|---|---|---|
| Native or prebuilt integration | The vendors already support the workflow you need. | Supported records and actions, plan access, permissions, sync direction, and which vendor handles support. |
| No-code or low-code connector | A connector is available and the workflow is mostly standard. | Trigger timing, field-mapping controls, plan limits, expected scale, and who monitors errors. |
| Middleware or workflow automation service | You need to connect products, transform data, or coordinate several steps. | Supported connectors, mapping and transformation options, access controls, error handling, and ongoing ownership. |
| Custom API integration | Prebuilt options do not meet the workflow or data requirements. | Authentication, available endpoints, rate limits, data model, security, error and retry handling, development effort, and maintenance. |
| Webhooks with API reads or writes | The workflow needs event-driven handling and the ATS supports suitable subscriptions. | HTTPS, signature verification, event identifiers, payload completeness, retries, and API access. |
Greenhouse describes integrations using APIs and webhooks, and identifies middleware such as MuleSoft, Boomi, and Workato as possible components. Those are examples to evaluate, not endorsements. Greenhouse also publishes an integration overview and a Harvest API reference; check current documentation for the products you actually use.
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Set up the connection in a controlled sequence
- Check for a supported connector. Review both vendors’ integration directories and setup guides. Confirm the relevant records, triggers, actions, plan requirements, and setup permissions. Also find out whether events are delivered immediately or detected on a schedule.
- Select the technical route. Use a prebuilt connector when its supported workflow is sufficient. Consider middleware when you need transformations or several coordinated steps. Use a custom API or webhook design when you need more control and can support the development and maintenance it requires. Greenhouse’s custom-integration guidance describes middleware, a developer, and a mapping schema as common requirements.
- Confirm access and authentication. Follow the instructions for the exact connector and API version. Verify that the person setting it up has the required administrative or developer role, and grant only the endpoint permissions the workflow needs. Do not assume two connectors for the same ATS use the same authentication method.
- Map fields and behavior. Match fields between systems deliberately. Specify how to handle missing values, updates, and duplicate candidates; do not assume a similarly named field has identical meaning in both products.
- Test before expanding. Run representative cases for new applications, candidates, and updates. Check the records created or changed in each system, confirm the payload contains the necessary data, and inspect how failures are reported. Start with a limited workflow scope, then expand once its behavior is understood.
- Assign ongoing ownership. Decide who will monitor failures and review credentials, permissions, API changes, rate limits, and workflow changes. An integration needs maintenance as well as initial setup.
Greenhouse examples: connector setup differs by product
Greenhouse is a useful illustration because its documentation covers multiple integration routes. It is not a substitute for instructions from the ATS and automation platform you plan to connect.
Zapier: Harvest API key
Zapier’s Greenhouse setup guide, updated April 10, 2026, describes a connection using a Greenhouse Harvest API key with required endpoint permissions. It requires a paid Zapier account, an active Greenhouse Recruiting account, and permission to manage API credentials. The guide covers triggers, searches, and actions. Zapier states a 100-job performance limitation for this Greenhouse app and notes that API rate limits apply; these are constraints of this connector, not general limits for every Greenhouse integration.
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Make: OAuth 2.0 and Harvest API V3
Greenhouse’s Make integration guide, updated August 18, 2026, describes OAuth 2.0 with Harvest API V3 and requires Greenhouse Developer permissions. It documents real-time webhook triggers and field mapping between modules. Use the current guide to confirm the steps and permissions for your account.
Custom event-driven integration
Greenhouse webhooks send event payloads as JSON over HTTPS POST. Its webhook documentation describes a unique Greenhouse-Event-ID and a secret-key signature that the receiving system can verify. A webhook payload may not contain every field the workflow needs, so confirm its contents for the event in question and determine whether the integration must fetch additional data through an API. Verify retry behavior for the specific event and receiving platform rather than assuming failed deliveries will be handled in a particular way.
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Candidate sourcing through the Ingestion API
The Greenhouse Candidate Ingestion API is a specific route for partner integrations to submit candidates and prospects, retrieve current candidate stage or status, and retrieve eligible jobs. The documentation describes OAuth 2.0 or Basic authentication depending on the use case. It is not a general-purpose automation API for every ATS workflow.
Secure and maintain webhook-based workflows
For an event-driven design, handle incoming events as data that must be authenticated, tracked, and reconciled—not as proof that all required candidate information has arrived.
- Use HTTPS for webhook delivery and verify the vendor’s signature where one is provided.
- Record event identifiers, such as Greenhouse’s
Greenhouse-Event-ID, so you can track deliveries and avoid processing the same event twice. - Confirm the payload fields and whether API reads are needed to complete the workflow.
- Check vendor-specific retry behavior, then design failure monitoring and recovery around what the vendor documents.
- Review access permissions, credentials, rate limits, and API-version changes as part of ongoing maintenance.
Check API versions and connector limits before implementation
Integration instructions and limits are specific to a product, connector, and API version. Greenhouse’s API overview states that Harvest API v1 and v2 were to become unavailable after August 31, 2026. That date has passed; consult Greenhouse’s current Harvest documentation instead of assuming either older version remains available. Confirm supported versions, permissions, and limits with both vendors before building or changing a live connection.
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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Likewise, Greenhouse offers several APIs—including Harvest, Job Board, Assessment, Ingestion, and Onboarding APIs—but the right one depends on the workflow. A sourcing partner’s need to submit candidates, for example, is different from a workflow that updates application status or orchestrates several recruiting tasks. Choose an API by the records and actions it explicitly supports.
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