aws-serverless

# AWS Serverless Specialized skill for building production-ready serverless applications on AWS. Covers Lambda functions, API Gateway, DynamoDB, SQS/SNS event-driven patterns, SAM/CDK deployment, and cold start optimization. ## Principles - Right-size memory and timeout (measure before optimizing) - Minimize cold starts for latency-sensitive workloads - Use SnapStart for Java/.NET functions - Prefer HTTP API over REST API for simple use cases - Design for failure with DLQs and retries - Keep deployment packages small - Use environment variables for configuration - Implement structured logging with correlation IDs ## Patterns ### Lambda Handler Pattern Proper Lambda function structure with error handling **When to use**: Any Lambda function implementation,API handlers, event processors, scheduled tasks ```javascript // Node.js Lambda Handler // handler.js // Initialize outside handler (reused across invocations) const { DynamoDBClient } = require('@aws-sdk/client-dynamodb'); const { DynamoDBDocumentClient, GetCommand } = require('@aws-sdk/lib-dynamodb'); const client = new DynamoDBClient({}); const docClient = DynamoDBDocumentClient.from(client); // Handler function exports.handler = async (event, context) => { // Optional: Don't wait for event loop to clear (Node.js) context.callbackWaitsForEmptyEventLoop = false; try { // Parse input based on event source const body = typeof event.body === 'string' ? JSON.parse(event.body) : event.body; ...