Lambda Power Tuning is an open-source Step Functions state machine that tests your function at every memory level and finds the exact cost/latency sweet spot automatically.

Switching Lambda functions from x86 to ARM64 Graviton3 cuts your bill 34% and improves performance 20% for most workloads. One line change in your configuration — with real benchmark data to back it up.

Lambda Function URLs give your function a direct HTTPS endpoint without API Gateway. Response streaming lets you stream data before your function completes — perfect for AI/LLM responses, file downloads, and real-time data.

Lambda SnapStart snapshots the fully initialized JVM after the init phase and restores it instantly on cold starts — dropping Java Lambda cold starts from 8 seconds to under 100ms without changing a line of application code.

Lambda Layers separate your dependencies from your function code. Shared libraries across functions, smaller deployment packages, faster cold starts, and centralized dependency management — all from a feature most developers underuse.

CloudWatch Insights is the most underused AWS debugging tool. These 10 production-tested queries find Lambda cold starts, latency spikes, memory leaks, and error patterns in minutes.

Presigned URLs seem simple but hide serious security traps: excessively long expiry, no bucket policy enforcement, credential exposure in logs, and SSRF vulnerability patterns.

DynamoDB single-table design feels counterintuitive at first. One table for everything, no joins, access patterns defined upfront. Once you understand it, you never go back.

Cold starts are killing your Lambda API. Here are 6 techniques that drop cold start latency from 2s to under 200ms — most of them completely free.