Data Conflicts Between Systems Cost More Than Outages, Engineer Warns

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Software engineer Serguey Shinder has highlighted a costly but overlooked problem: two systems running correctly yet reporting contradictory data about the same fact. His example involves a CRM showing a customer on a premium plan while the billing system records them on a free tier, leaving support and finance teams trusting different sources. Shinder argues the root cause is duplicating data across services without clearly designating a single authoritative owner for each fact. He warns that nightly reconciliation jobs are a symptom of accepting data drift rather than preventing it. His recommended fix is to explicitly declare where each piece of data lives and ensure all other copies remain read-only reflections of that source.

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