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Migrating from a monolithic architecture to microservices is one of the most challenging transformations a development team can undertake. Here's how we approached this journey for a legacy ERP system.
Starting Point
The legacy system was a 15-year-old monolithic application with:
- Millions of lines of code
- Tightly coupled components
- Single database for all functionality
Our Migration Strategy
We adopted a strangler fig pattern, gradually extracting functionality into independent services:
- Identified service boundaries using domain-driven design
- Created API gateways for routing
- Implemented event-driven communication
- Deployed to Kubernetes for orchestration
Key Learnings
The migration took 18 months but resulted in 10x improvement in deployment frequency and 99.9% uptime.
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