Scalable serverless architecture for StartApp leverages AWS Lambda across multiple availability zones with Route 53 DNS, CloudFront CDN, and WAF protection for global traffic distribution. The primary Lambda function processes synchronous API requests via API Gateway and writes to DynamoDB, while an asynchronous Lambda function consumes SQS messages and persists data to S3. CloudWatch monitors all Lambda executions and API activity, IAM manages fine-grained permissions, and Shield provides DDoS protection at the edge. This multi-tier design demonstrates production-ready serverless patterns: request isolation across AZs, event-driven processing decoupling, and comprehensive observability. Fork and customize this diagram on Diagrams.so to adapt the VPC CIDR blocks, Lambda concurrency limits, or DynamoDB provisioning for your workload.