Logeshwaran, Author at CheatCoders

Lambda in VPC Without the 10-Second Cold Start: The Fix Most Teams Missed

Lambda VPC cold starts used to add 10 seconds. AWS fixed this with Hyperplane ENIs in 2019 — but most teams still configure VPC in ways that break the optimization. Here is what actually works.

AWS

Lambda Extensions API: Build Custom Monitoring Without Touching Application Code

Lambda Extensions are sidecar processes that run in the same execution environment as your function. They power Datadog, New Relic, and HashiCorp Vault integrations. Here is how to build your own.

AWS

Lambda Power Tuning: Find the Exact Memory Size That Minimizes Cost and Latency

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.

AWS

Lambda on ARM64 Graviton3: 34% Cheaper and 20% Faster Than x86

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.

AWS

Lambda Function URLs with Streaming: Replace API Gateway for 90% of Use Cases

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.

AWS

AWS Lambda SnapStart: Sub-100ms Cold Starts for Java Without Changing Your Code

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.

Node.js

Node.js Async Hooks: The Tracing API That Powers Every APM Tool

Node.js async_hooks tracks execution context across async boundaries. It powers Datadog, New Relic, and OpenTelemetry. Understanding it lets you build request tracing, correlation IDs, and automatic logging without threading context through every function call.