A single ATS-to-HRIS transcription error cost David's manufacturing company $27K and an employee. The fix wasn't a policy — it was architecture: structured error handlers, centralized logging, and instant Slack alerts built inside Make.com™. This case study shows exactly how that error handling system was built and what it prevents.

HR data duplication is not a cleanup problem - it is a workflow architecture problem. Solving it requires embedding a search-before-create gate directly inside every Make.com mailhook scenario. Parse the incoming email, extract a unique identifier, query your system of record, then branch: update if the record exists, create only if it does not. Build this once and duplicates stop at the source.