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AWS Serverless Patterns and Anti-Patterns: A Production Design Guide

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AWS serverless architecture goes beyond simply using Lambda — it is a design philosophy built around managed services, pay-per-use pricing, and independent scaling. Key patterns include using API Gateway HTTP APIs for cost-effective routing, event-driven processing with SQS and EventBridge, and AWS Step Functions for complex multi-step workflows. Common anti-patterns include building Lambda monoliths, skipping Dead Letter Queues, and ignoring idempotency in event-driven systems. The guide outlines trade-offs between services such as HTTP API versus REST API, and Standard versus Express Step Functions workflows. A decision framework is provided to help developers determine when serverless is the right architectural choice and when it may introduce unnecessary complexity or cost.

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