Scalable Architecture Designer

I'm building a Type of application (e.g., 'real-time chat app', 'e-commerce marketplace'). 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: Key technical or business requirements Present the architecture as a clear component diagram (text-based) followed by detailed explanations.