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Zero-Downtime Cloud Migration
Migrating 50+ legacy applications to AWS with zero business disruption
Overview
Project Overview
GlobalInsure, a Fortune 500 insurance company, operated 50+ mission-critical applications in aging on-premise data centers. Infrastructure costs exceeded $8M annually, scalability was limited, and disaster recovery was inadequate. They needed cloud migration without disrupting 24/7 operations serving 2 million policyholders.
We executed a comprehensive cloud migration to AWS over 8 months, moving 50 applications, 200+ databases, and 500TB of data with zero unplanned downtime. The new cloud infrastructure is elastic, resilient, and costs 55% less to operate.
Challenge
The Challenge
Zero Downtime Required: 24/7 operations couldn't tolerate service interruptions- Legacy Applications: 20-year-old applications with undocumented dependencies
- Data Volume: 500TB of sensitive customer data requiring secure transfer
- Regulatory Compliance: HIPAA, SOC 2, and state insurance regulations
- Skills Gap: Internal team lacked cloud expertise for management
Solution
Our Solution
- Migration Strategy: Phased approach using 7R framework (rehost, replatform, refactor)
- Data Transfer: AWS Snowball and Database Migration Service for secure transfer
- Parallel Running: Applications ran in parallel (on-prem + cloud) during cutover
- Infrastructure as Code: Terraform for reproducible, version-controlled infrastructure
- DR & Backup: Multi-region deployment with automated backup and failover
- Training & Support: Comprehensive cloud training for internal teams
Results
Measurable Results
Zero
Unplanned downtime during migration
55%
Reduction in infrastructure operating costs
10X
Faster deployment times for new features
99.99%
Uptime achieved post-migration
GlobalInsure now scales automatically during peak seasons, deploys updates weekly instead of quarterly, and has comprehensive disaster recovery with <5-minute RTO.