Monolith to Microservices: DevOps-Driven Migration
Breaking legacy .NET/Java monoliths with GitOps and progressive rollouts
The Challenge
An enterprise company had a 10-year-old .NET monolith with 500K+ lines of code. Deployments took 4 hours, scaling was all-or-nothing, and a bug in one module could crash the entire application. Teams could not work independently, and feature velocity had ground to a halt. They needed to decompose the monolith without a big-bang rewrite.
Strangler Pattern Migration
🔪
Domain-Driven Decomposition
Identified bounded contexts and extracted high-value services first (auth, payments, notifications) using the strangler fig pattern.
🚀
Service Templates
Created standardized microservice templates with CI/CD, observability, health checks, and deployment manifests baked in.
📦
GitOps Workflows
Implemented Argo CD for declarative deployments, environment promotion, and rollback capabilities across 20+ microservices.
🎯
Progressive Rollouts
Deployed services with canary analysis, feature flags, and traffic routing to safely migrate functionality without big-bang cutover.
Results & Impact
90%
Faster deployments
From 4 hours to 15 minutes
75%
Reduction in incidents
Isolated failures, faster recovery
5x
Development velocity
Teams deploy independently
20
Microservices extracted
Monolith reduced by 60%
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