Migrating from monolith to microservices is one of the biggest architectural challenges. Based on my experience leading migration at Badr Interactive, here are strategies that proved effective.
Why Migrate?
The monolith we had was serving millions of users, but showed signs of strain:
- Deployment bottleneck — Teams waiting for each other
- Inefficient scaling — All modules scaled together
- Technology lock-in — Hard to try new technologies
Strangler Fig Strategy
We used the Strangler Fig Pattern — replacing functionality one piece at a time:
- Identify Bounded Contexts — Map domains into independent services
- Extract First Service — Start with the most independent module (authentication)
- API Gateway Pattern — Using Kong API Gateway for routing
- Database per Service — Each service owns its database
Infrastructure
# Deployment on AWS EKS
apiVersion: apps/v1
kind: Deployment
metadata:
name: user-service
spec:
replicas: 3
selector:
matchLabels:
app: user-service
Key Lessons
- Don't refactor while adding features — Separate migration teams from feature teams
- Observability first — Ensure tracing and monitoring before cutover
- Feature flags — Enable easy rollback if issues arise
Results: 50% faster deployments, 3x more scalable, and teams work more independently.