AWS Cloud Patterns Lambda Function Pattern Initialize SDK clients outside the handler to reuse connections across invocations. DynamoDB Single-Table Design Design access patterns first, then model keys. Use GSIs for alternative query patterns. CDK Infrastructure S3 Event Processing Anti-Patterns - Hardcoding AWS credentials instead of using IAM roles - Not setting Lambda timeout and memory appropriately - Using equivalent scans on DynamoDB instead of query with key conditions - Creating one Lambda per CRUD operation instead of grouping by domain - Missing CloudWatch alarms for error rates and…