Serverless multi-tenant SaaS platform leveraging Route 53 latency routing, CloudFront with Lambda@Edge, and API Gateway to distribute traffic across isolated tenant workloads. Identity flows through Cognito User Pool with MFA and SAML, while compute scales via Lambda functions orchestrated by EventBridge and Step Functions, with async jobs queued in SQS and fanned out via SNS. Data isolation is enforced through per-tenant DynamoDB tables, S3 prefixes with KMS encryption, and Aurora Serverless v2 replicas across availability zones, all accessed via VPC endpoints and RDS Proxy. Observability spans CloudWatch Logs with structured JSON, X-Ray tracing, and CloudWatch Alarms feeding SNS on-call alerts, while IAM roles enforce least-privilege access and AWS WAF blocks OWASP threats. Fork this diagram to customize tenant isolation strategies, add region failover, or adjust compute concurrency limits for your SaaS workload.