DEVOPS / ARCHITECTURE

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

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Domain-Driven Decomposition

Identified bounded contexts and extracted high-value services first (auth, payments, notifications) using the strangler fig pattern.

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Service Templates

Created standardized microservice templates with CI/CD, observability, health checks, and deployment manifests baked in.

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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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