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# Introduction

Modern infrastructure demands robust, scalable architectures. This white paper outlines the core principles of building resilient distributed systems that handle high throughput while maintaining strong consistency guarantees.

## Architecture Overview

The system is composed of three primary layers:
1. **Edge Routing**: Handles incoming requests and TLS termination.
2. **Compute Fleet**: Stateless application servers.
3. **Storage Tier**: Distributed database and caching layer.

### System Components

| Component | Technology | Purpose |
| --- | --- | --- |
| Load Balancer | HAProxy | Traffic distribution |
| API Gateway | Node.js | Request validation and routing |
| Database | PostgreSQL | Relational data persistence |
| Cache | Redis | Session state and query caching |

## Implementation Details

The following snippet demonstrates the caching strategy used in the API Gateway.

~~~typescript
export async function getUserProfile(userId: string) {
  const cacheKey = \`user:\${userId}\`;
  
  // Try cache first
  const cached = await redis.get(cacheKey);
  if (cached) return JSON.parse(cached);
  
  // Fallback to database
  const user = await db.users.findById(userId);
  if (user) {
    await redis.set(cacheKey, JSON.stringify(user), { EX: 3600 });
  }
  
  return user;
}
~~~

## Conclusion

By separating compute from state, the architecture remains highly available and horizontally scalable.

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Acme Corp

System Architecture V2

A proposal for distributed resilience

Prepared by

Engineering Team

Organization

Acme Corp

Format

Letter