An e-commerce marketplace had outgrown its monolithic PHP backend. Page loads exceeded 3 seconds, checkout failures hit 12%, and deploying a feature took two weeks of regression testing.
Phased migration using the strangler fig pattern. New Node.js services intercepted traffic for specific domains while the monolith continued serving everything else. GraphQL federation, Docker containers on AWS ECS.
GraphQL federation for a single frontend endpoint. Redis caching with 15-second TTL. Event-driven saga pattern with SQS for checkout — payment, inventory, and fulfillment as separate transactions with compensating actions.
API response under 80ms at p95. Checkout failures dropped from 12% to 0.3%. Multiple daily deploys instead of biweekly. Handles 3x traffic spikes without intervention.
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