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Zero-Downtime EHR Migration to Cloud

Healthcare Network

A major healthcare network with 50 hospitals needed to migrate from legacy on-premises EHR to cloud without affecting patient care or losing a single record.

The Challenge

The system was processing 500M+ patient records, 50k+ daily transactions, and had zero tolerance for downtime. HIPAA compliance was critical.

Our Solution

  • Designed parallel system architecture with real-time synchronization
  • Implemented staged migration of 50 hospitals over 6 months
  • Created dual-write pattern maintaining data consistency
  • Built comprehensive disaster recovery and rollback procedures
  • Automated testing with 10k+ test cases ensuring data integrity

Key Outcomes

  • 100% uptime during entire migration
  • Zero data loss or corruption
  • 40% reduction in operational costs
  • HIPAA compliance maintained throughout
  • 2x improvement in system performance

Technologies Used

AWSTerraformPostgreSQLKafkaJava

Results

The healthcare network maintained perfect uptime during the migration, reducing operational costs by 40% while improving system performance and reliability.

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