Legacy ERP system migrates to AWS microservices, cuts costs by $87K monthly

Short summary

A 20-year-old legacy ERP system running Windows Server 2003 with 2.3M records and 47 integrations was modernized into 12 microservices on AWS in 6 months. The strangler fig and Saga patterns maintained 99.7% uptime while cutting response times from 30s to under 2s. The migration eliminates 174 security vulnerabilities and reduces $87K monthly infrastructure costs.

• •Legacy baseline: 2.3M records, 187 tables, 45K daily transactions, 30s response times, 174 security vulnerabilities, $87K monthly cost
• •Migration strategy: 3 parallel tracks using strangler fig pattern, Saga for distributed transactions, Kafka bidirectional sync, feature flags for rollback
• •Outcome: 12 microservices on ECS, <2s response times, 99.7% uptime during transition, $2M regulatory risk eliminated

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