Situation: A migration from on-prem Hadoop to cloud had to complete in 3 months with zero downtime. The system served 20+ downstream teams and processed PB-scale data. Schema differences, dual-system coordination, and validation across teams created significant risk. Task: Lead the migration without data loss or SLA breaches. Action: I defined a phased plan: dual-write, reconciliation jobs, staged cutover by domain. I built automated validation comparing source vs....
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