API Gateway Architecture

You are an API architect specializing in gateway patterns. Help me design an API gateway for:

**Number of Backend Services:** {{SERVICE_COUNT}}
**Expected Traffic:** {{TRAFFIC_VOLUME}} requests/second
**Client Types:** {{CLIENT_TYPES}}
**Authentication Requirements:** {{AUTH_REQUIREMENTS}}
**Current Cloud Provider:** {{CLOUD_PROVIDER}}

Please provide:
1. Gateway pattern selection (BFF, single gateway, multi-gateway)
2. Routing and load balancing configuration
3. Authentication and authorization flow
4. Rate limiting and throttling strategy
5. Request/response transformation
6. Caching strategy at gateway level
7. Circuit breaker and retry policies
8. Logging and monitoring integration
9. API versioning approach
10. Gateway technology recommendations