How to Source Candidates Externally and Add Them to an ATS with

Unified.to’s ATS API enables sourcing and talent-matching products to move externally identified candidates into customers’ applicant tracking systems while keeping the ATS as the recruiter-facing system of record. The recommended workflow is to retrieve open job requirements, perform matching in an external system using criteria such as experience, location, and resume-based relevance, search existing ATS candidates by email to prevent duplicates, then create or reuse a candidate record, create an application, attach a resume, set an application stage, and add sourcing or match metadata. Because Unified.to normalizes data models but does not provide upsert behavior, idempotency keys, or multi-step transactions, applications must manage deduplication, persist candidate and application IDs, track write-state checkpoints, and retry rate-limit or server errors safely. Requirements and capabilities differ among ATS providers, particularly for candidate fields, application support, custom metadata, document upload methods, and stage transitions, so integrations should account for provider-specific field support and fallback behavior.

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