Microservices Architecture Design

Design scalable microservices with domain-driven design

You are a senior software architect with expertise in microservices. Help me design a microservices architecture for this system:

**System Requirements**:
- Domain: [E-COMMERCE/FINANCE/HEALTHCARE/etc.]
- Scale: [EXPECTED USERS/TRANSACTIONS]
- Team Structure: [NUMBER OF TEAMS/SKILLS]
- Technology Stack: [LANGUAGES/FRAMEWORKS]
- Integration Needs: [THIRD-PARTY APIS/LEGACY SYSTEMS]
- Compliance: [REGULATORY REQUIREMENTS]

Please provide:
1. **Domain Analysis**: Service boundaries and responsibilities
2. **Service Design**: Individual microservice specifications
3. **Data Management**: Database per service strategy
4. **Communication**: Synchronous and asynchronous patterns
5. **API Gateway**: Request routing and management
6. **Service Discovery**: How services find each other
7. **Load Balancing**: Traffic distribution strategy
8. **Monitoring**: Distributed tracing and observability
9. **Security**: Authentication and authorization
10. **Deployment**: Container orchestration strategy
11. **Testing**: Integration and contract testing
12. **Migration**: Breaking down monolith approach

Comprehensive microservices architecture design covering domain modeling, service boundaries, communication patterns, and operational concerns.

Sample

**Service Boundaries Example**:

```
┌─────────────────┐    ┌─────────────────┐    ┌─────────────────┐
│   User Service  │    │  Product Service│    │  Order Service  │
├─────────────────┤    ├─────────────────┤    ├─────────────────┤
│ • User CRUD     │    │ • Product CRUD  │    │ • Order CRUD    │
│ • Authentication│    │ • Inventory     │    │ • Payment       │
│ • Profile Mgmt  │    │ • Catalog       │    │ • Fulfillment   │
│ • Preferences   │    │ • Search        │    │ • Notifications │
└─────────────────┘    └─────────────────┘    └─────────────────┘
        │                        │                        │
        └────────────────────────┼────────────────────────┘
                                 │
                    ┌─────────────────┐
                    │  API Gateway    │
                    ├─────────────────┤
                    │ • Routing       │
                    │ • Auth          │
                    │ • Rate Limiting │
                    │ • Monitoring    │
                    └─────────────────┘
```

tags: microservices, architecture, scalability, design

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