Serverless Patterns

Production patterns for AWS Lambda and serverless architectures — cold starts, event routing, orchestration, and observability.

When to Activate

• Diagnosing Lambda cold start latency
• Designing event-driven workflows (S3 → Lambda, SQS batch processing)
• Building Step Functions state machines
• Adding structured logging/tracing with Lambda Powertools
• Calculating serverless cost vs. container cost
• Implementing idempotency for at-least-once delivery
• Choosing between Provisioned Concurrency, SnapStart, or keep-warm pings for a latency-sensitive function
• Debugging partial batch failures in SQS or DynamoDB Streams event source mappings

Cold Start Deep Dive