---

name: posthog-reference-architecture description: | Implement PostHog reference architecture with best-practice project layout. Use when designing new PostHog integrations, reviewing project structure, or establishing architecture standards for PostHog applications. Trigger with phrases like "posthog architecture", "posthog best practices", "posthog project structure", "how to organize posthog", "posthog layout". allowed-tools: Read, Grep version: 1.0.0 license: MIT author: Jeremy Longshore jeremy@intentsolutions.io

PostHog Reference Architecture

Overview

Production-ready architecture patterns for PostHog integrations.

Prerequisites

• Understanding of layered architecture
• PostHog SDK knowledge
• TypeScript project setup
• Testing framework configured

Project Structure

Copymy-posthog-project/
├── src/
│   ├── posthog/
│   │   ├── client.ts           # Singleton client wrapper
│   │   ├── config.ts           # Environment configuration
│   │   ├── types.ts            # TypeScript types
│   │   ├── errors.ts           # Custom error classes
│   │   └── handlers/
│   │       ├── webhooks.ts     # Webhook handlers
│   │       └── events.ts       # Event processing
│   ├── services/
│   │   └── posthog/
│   │       ├── index.ts        # Service facade
│   │       ├── sync.ts         # Data synchronization
│   │       └── cache.ts        # Caching layer
│   ├── api/
│   │   └── posthog/
│   │       └── webhook.ts      # Webhook endpoint
│   └── jobs/
│       └── posthog/
│           └── sync.ts         # Background sync job
├── tests/
│   ├── unit/
│   │   └── posthog/
│   └── integration/
│       └── posthog/
├── config/
│   ├── posthog.development.json
│   ├── posthog.staging.json
│   └── posthog.production.json
└── docs/
    └── posthog/
        ├── SETUP.md
        └── RUNBOOK.md

Layer Architecture

Copy┌─────────────────────────────────────────┐
│             API Layer                    │
│   (Controllers, Routes, Webhooks)        │
├─────────────────────────────────────────┤
│           Service Layer                  │
│  (Business Logic, Orchestration)         │
├─────────────────────────────────────────┤
│          PostHog Layer        │
│   (Client, Types, Error Handling)        │
├─────────────────────────────────────────┤
│         Infrastructure Layer             │
│    (Cache, Queue, Monitoring)            │
└─────────────────────────────────────────┘

Key Components

Step 1: Client Wrapper

Copy// src/posthog/client.ts
export class PostHogService {
  private client: PostHogClient;
  private cache: Cache;
  private monitor: Monitor;

  constructor(config: PostHogConfig) {
    this.client = new PostHogClient(config);
    this.cache = new Cache(config.cacheOptions);
    this.monitor = new Monitor('posthog');
  }

  async get(id: string): Promise<Resource> {
    return this.cache.getOrFetch(id, () =>
      this.monitor.track('get', () => this.client.get(id))
    );
  }
}

Step 2: Error Boundary

Copy// src/posthog/errors.ts
export class PostHogServiceError extends Error {
  constructor(
    message: string,
    public readonly code: string,
    public readonly retryable: boolean,
    public readonly originalError?: Error
  ) {
    super(message);
    this.name = 'PostHogServiceError';
  }
}

export function wrapPostHogError(error: unknown): PostHogServiceError {
  // Transform SDK errors to application errors
}

Step 3: Health Check

Copy// src/posthog/health.ts
export async function checkPostHogHealth(): Promise<HealthStatus> {
  try {
    const start = Date.now();
    await posthogClient.ping();
    return {
      status: 'healthy',
      latencyMs: Date.now() - start,
    };
  } catch (error) {
    return { status: 'unhealthy', error: error.message };
  }
}

Data Flow Diagram

CopyUser Request
     │
     ▼
┌─────────────┐
│   API       │
│   Gateway   │
└──────┬──────┘
       │
       ▼
┌─────────────┐    ┌─────────────┐
│   Service   │───▶│   Cache     │
│   Layer     │    │   (Redis)   │
└──────┬──────┘    └─────────────┘
       │
       ▼
┌─────────────┐
│ PostHog    │
│   Client    │
└──────┬──────┘
       │
       ▼
┌─────────────┐
│ PostHog    │
│   API       │
└─────────────┘

Configuration Management

Copy// config/posthog.ts
export interface PostHogConfig {
  apiKey: string;
  environment: 'development' | 'staging' | 'production';
  timeout: number;
  retries: number;
  cache: {
    enabled: boolean;
    ttlSeconds: number;
  };
}

export function loadPostHogConfig(): PostHogConfig {
  const env = process.env.NODE_ENV || 'development';
  return require(`./posthog.${env}.json`);
}

Instructions

Step 1: Create Directory Structure

Set up the project layout following the reference structure above.

Step 2: Implement Client Wrapper

Create the singleton client with caching and monitoring.

Step 3: Add Error Handling

Implement custom error classes for PostHog operations.

Step 4: Configure Health Checks

Add health check endpoint for PostHog connectivity.

Output

• Structured project layout
• Client wrapper with caching
• Error boundary implemented
• Health checks configured

Error Handling

Examples

Quick Setup Script

Copy# Create reference structure
mkdir -p src/posthog/{handlers} src/services/posthog src/api/posthog
touch src/posthog/{client,config,types,errors}.ts
touch src/services/posthog/{index,sync,cache}.ts

Resources

• PostHog SDK Documentation
• PostHog Best Practices

Flagship Skills

For multi-environment setup, see posthog-multi-env-setup.