How to Build Interview Scheduling Across Greenhouse, Outlook and Google Calendar with
Blog post from Unified.to
Unified.to’s interview-scheduling approach connects applicant tracking systems such as Greenhouse with calendar platforms including Microsoft Outlook and Google Calendar through normalized ATS and Calendar & Meetings APIs. Recruiting products can use the embedded authorization flow to obtain customer connection IDs, retrieve candidate, application, interview, and job information, then create calendar events containing interview times, attendees, locations, conferencing details, notes, and notification settings. The resulting calendar event ID can be saved to an ATS interview’s external_event_xref field on supported systems such as Greenhouse, Carerix, and Gem, while unsupported systems require the product to maintain its own mapping. The guide also describes updating or creating ATS interviews where available, responding to calendar event updates, deletions, and cancellations, and accounting for integration-specific differences in writable fields and notification support. By providing shared schemas, authorization, and change events across many ATS and calendar providers, the platform aims to reduce the need for separate vendor-specific scheduling integrations.
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