Feature: [Your Feature Name]

📖 Executive Summary

Business Value

• Problem Statement: What business problem does this solve?
• Target Users: Who will use this feature?
• Success Metrics: How will you measure success?
• Business Impact: Revenue, user engagement, operational efficiency?

Technical Alignment

• Architecture Fit: How does this align with the microservices architecture?
• Service Boundaries: Which services will be affected or created?
• Data Ownership: Which service owns the feature’s data?

🎯 Feature Requirements

Functional Requirements

1. [Requirement ID]: [Clear, testable requirement]
   • Acceptance Criteria:
     • Given [context]
     • When [action]
     • Then [expected outcome]
   • Priority: Must Have / Should Have / Could Have / Won’t Have
2. [Next Requirement]…

Non-Functional Requirements

• Performance: Response time, throughput expectations
• Scalability: Expected load, growth patterns
• Security: Authentication, authorization, data protection
• Reliability: Availability, error handling, recovery
• Usability: User experience considerations

🏗️ Technical Design

Service Architecture

• New Services: What new microservices need to be created?
• Modified Services: Which existing services need changes?
• Service Communication: How will services communicate? (sync/async)
• Data Flow: Map the data flow through your feature

Database Design

• New Tables/Collections: Schema design
• Data Relationships: How does your data relate to existing entities?
• Migration Strategy: How will you handle schema changes?

Event Design

• Domain Events: What events will your feature publish?
• Integration Events: How will you integrate with other services?
• Event Handlers: What background processing is needed?

API Design

Example API endpoints

GET /api/[service]/[resource] POST /api/[service]/[resource] PUT /api/[service]/[resource]/{id} DELETE /api/[service]/[resource]/{id}

🔄 Implementation Roadmap

Phase 1: Foundation (Week 1-2)

• Service scaffolding
• Database schema
• Basic CRUD operations

Phase 2: Core Features (Week 3-4)

• Business logic implementation
• Event integration
• API development

Phase 3: Integration (Week 5-6)

• Frontend integration
• Service communication
• End-to-end testing

Phase 4: Polish (Week 7-8)

• Performance optimization
• Security hardening
• Documentation

🧪 Testing Strategy

Unit Testing

• Service layer tests
• Domain logic tests
• Repository tests

Integration Testing

• API endpoint tests
• Database integration tests
• Event handler tests

End-to-End Testing

• User workflow tests
• Cross-service integration tests
• Performance tests

📊 Monitoring & Observability

Metrics

• Business metrics to track
• Technical metrics to monitor
• SLA/SLO definitions

Logging

• Structured logging requirements
• Log correlation across services
• Security audit logging

Alerting

• Critical alerts
• Performance degradation alerts
• Business metric alerts

🚨 Risk Assessment

Technical Risks

• Risk: [Description]
  • Probability: High/Medium/Low
  • Impact: High/Medium/Low
  • Mitigation: [Strategy]

Business Risks

• Risk: [Description]
  • Mitigation: [Strategy]

🎓 Decision Log

Use this section to document key decisions made during feature design:

Decision 1: [Title]

• Context: Why was this decision needed?
• Options Considered: What alternatives were evaluated?
• Decision: What was chosen?
• Rationale: Why was this the best choice?
• Consequences: What are the implications?

📚 References

• External APIs or services referenced
• Design patterns used
• Industry best practices followed
• Performance benchmarks