Logeshwaran, Author at CheatCoders

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.

Debugging

Debugging Production Postgres Slow Queries Without Causing Downtime

Production Postgres slowdowns need diagnosis without adding load or taking downtime. pg_stat_activity, auto_explain, pg_stat_statements, and lock monitoring give you the full picture without guessing.

JavaScript

JavaScript Proxy Object: The Most Underused Feature in the Language

JavaScript Proxy intercepts fundamental object operations at runtime. Validation, auto-logging, memoization, observable state, and negative array indexing — all implementable in under 20 lines each.

AWS

AWS Lambda Layers: The Dependency Management Pattern You Should Be Using

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.

Python

Python typing Module: Generics and Protocols That Catch Real Bugs at Compile Time

Python typing goes far beyond basic annotations. Generics, Protocol classes, TypeVar constraints, and ParamSpec let mypy catch bugs that unit tests miss entirely.

Node.js

Node.js Cluster Module: Scale Your API to All CPU Cores Without Kubernetes

Node.js is single-threaded, but your server has 8 CPU cores sitting idle. The cluster module spawns one worker per core, routes traffic between them, and enables zero-downtime restarts — no orchestration needed.

System Design

Designing a URL Shortener That Handles 100 Million Requests Per Day

Designing a URL shortener is a classic system design question — but building one that handles 100M requests/day requires careful decisions about encoding, caching, database choice, and read/write separation.

JavaScript

TypeScript Generics Deep Dive: Advanced Patterns That Eliminate Entire Bug Classes

TypeScript generics go far beyond simple type parameters. Conditional types, the infer keyword, mapped types, and template literal types let you make illegal states unrepresentable.

AWS

AWS CloudWatch Insights Queries That Actually Find Production Bugs

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.