Serverless API Resilience

Design and deploy a complete serverless REST API that demonstrates real-world resilience patterns tested in the SAP-C02 exam. Create a DynamoDB table as the data store, deploy two Python Lambda functions for order creation and retrieval, and front them with API Gateway with throttling controls. Implement dead-letter queue error handling for failed Lambda invocations and configure reserved concurrency limits. Build an operational CloudWatch dashboard with invocation metrics, error rates, API Gateway response codes, DynamoDB consumed capacity, and DLQ message visibility. Test the system end-to-end: verify successful requests, throttling behavior (429 responses), error handling for invalid inputs, and DLQ routing. Covers serverless architecture design, operational excellence, and reliability patterns from SAP-C02 Domain 1 (Design Resilient Architectures) and Domain 2 (Design High-Performing Architectures).