Microservice Event-Driven
MicroservicesDomain-driven microservices with event sourcing, CQRS analytics, and dead letter isolation
11 nodes11 connections
Use Case
Event-driven microservices, domain-driven design, CQRS
Stack Breakdown
API GatewayAuthNestJSExpressKafkaAnalytics
Architecture Layers
1Gateway
2Auth
3Domain Services
4Event Bus
5Analytics
6Error Isolation
Components by Category
backend
API GatewayAuth ServiceNestJSExpressNotification Service
async
KafkaQueue WorkerDead Letter Queue
database
PostgreSQLMongoDBClickHouse
Why This Topology Works
Kafka event bus decouples domain services, enabling independent deployment and scaling. Each service owns its data. Dead letter queue prevents cascade failures.
Scaling Notes
Each microservice scales independently. Kafka partitioning by entity key ensures ordered processing. Auth service caches tokens in Redis.
Observability
Distributed tracing across service boundaries. Kafka consumer lag monitoring. Per-service error rate dashboards.