Client → API Gateway → Service 1
                    → Service 2
                    → Service 3

Service A → Event Bus → Service B
           → Service C

// Fails fast when service is unavailable
const breaker = new CircuitBreaker(async () => {
  return await serviceCall();
}, {
  threshold: 5,        // Fail after 5 errors
  timeout: 60000       // Check after 60s
});

// Exponential backoff
const maxRetries = 3;
const baseDelay = 1000;
for (let i = 0; i < maxRetries; i++) {
  try {
    return await service.call();
  } catch (e) {
    if (i === maxRetries - 1) throw e;
    await sleep(baseDelay * Math.pow(2, i));
  }
}

Transaction 1: Service A
  ↓ success
Transaction 2: Service B
  ↓ success
Transaction 3: Service C
  ↓ failure → Compensating transactions

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