#aws-lambda

Design a serverless application on AWS. Architecture: 1. API Gateway for HTTP endpoints. 2. Lambda functions for business logic (Node.js/Python). 3. DynamoDB for NoSQL storage. 4. S3 for file uploads with presigned URLs. 5. EventBridge for scheduled tasks. 6. SQS for async processing. 7. CloudWatch for logs and metrics. Use SAM or Serverless Framework for deployment. Implement proper error handling, retries, and dead-letter queues. Include cost optimization strategies (provisioned concurrency, reserved capacity).

Deploy and manage serverless applications using AWS Lambda with infrastructure automation and monitoring best practices. Lambda function optimization: 1. Runtime selection: Node.js 18+ for JavaScript, Python 3.9+ for data processing, Go for performance. 2. Memory allocation: 128MB-10GB, CPU scales proportionally, cost optimization through right-sizing. 3. Cold start mitigation: provisioned concurrency for critical functions, connection pooling. 4. Package optimization: tree-shaking for smaller bundles, layer usage for shared dependencies. Infrastructure management: 1. SAM (Serverless Application Model): template-driven deployment, local testing environment. 2. Serverless Framework: multi-cloud support, plugin ecosystem, environment management. 3. CDK (Cloud Development Kit): programmatic infrastructure, type safety, reusable constructs. Event-driven architecture: 1. API Gateway: REST/HTTP APIs, request/response transformation, caching (5-minute TTL). 2. Event sources: S3 triggers, DynamoDB streams, SQS/SNS integration, scheduled events. 3. State management: Step Functions for workflow orchestration, error handling, retry logic. Monitoring and observability: 1. CloudWatch metrics: invocation count, duration (target <1000ms), error rate (<0.1%). 2. X-Ray tracing: distributed tracing, performance bottleneck identification. 3. Log aggregation: structured logging, log retention policies, cost optimization. Security practices: IAM role-based access, VPC configuration for database access, secrets management with Parameter Store/Secrets Manager, input validation.

Build serverless with AWS Lambda. Architecture: 1. Function handler receives event. 2. Stateless execution. 3. Cold start optimization. 4. Environment variables for config. 5. IAM roles for permissions. 6. API Gateway for HTTP triggers. 7. EventBridge for scheduling. 8. CloudWatch for logs and monitoring. Use Serverless Framework or SAM. Keep functions small and focused. Mind execution time limits.