Scalable Architecture Designer

I'm building a {{app_type}}. Design a scalable architecture that includes:

1. Frontend — framework choice with justification
2. Backend — API design, service layer, authentication approach
3. Database — schema strategy, choice of SQL vs NoSQL with reasoning
4. Caching — what to cache and where
5. Queue/Async processing — if applicable
6. Infrastructure — deployment strategy on AWS
7. Monitoring & Observability — logging, metrics, alerting

For each component:

• Explain why you chose it over alternatives
• Note the trade-offs
• Identify the scaling bottleneck and how to address it

Expected scale: 10K-100K users Key requirements: {{requirements}}

Present the architecture as a clear component diagram (text-based) followed by detailed explanations.