How to Create Candidates and Applications in ATS Systems with
Blog post from Unified.to
Unified.to’s ATS API supports writing sourced or referred candidates into customer ATS platforms through a sequence of creating a candidate, creating an application linked to a job, optionally attaching documents, and updating application status. Because required and writable fields, supported objects, document attachment methods, and status behavior vary significantly by provider, developers must consult each integration’s Writable Fields documentation and generally assume candidate and job identifiers are required for applications. The API does not provide built-in idempotency, duplicate prevention, upsert behavior, universal stage-transition rules, or detailed ATS-specific error schemas, making application-level deduplication, retry controls, logging, and provider-aware throttling necessary. Document uploads may require base64 data or URLs and can attach to candidates, applications, or jobs depending on the ATS, while some platforms, such as Workday REST, support candidate creation without application objects. Errors generally use standard HTTP status codes, and exponential backoff is recommended for rate limits and transient provider failures.
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