CheatCoders - Secret coding knowledge that gives developers an unfair advantage

System Design Interview Cheat Sheet: The Framework That Gets You Hired at FAANG

The system design interview framework that consistently gets offers at FAANG — requirements scoping, capacity estimation, API design, component breakdown, database selection, and scaling. With worked examples.

System Design

Rust for JavaScript and Python Developers: Why It Is Worth the Learning Curve

Rust is the most admired language for four years running, but most JS and Python developers do not know where to start. This guide explains ownership with analogies, when Rust is the right tool, and the use cases where it beats everything else.

System Design

REST API Design Best Practices: The Patterns That Make APIs a Joy to Use

The REST API design decisions that make or break developer experience — versioning strategy, error format, pagination, idempotency keys, rate limiting headers, and the spec-first workflow that prevents breaking changes.

Debugging

Docker Best Practices: Build Smaller, Faster, More Secure Images in Production

Docker image problems cost teams hours of CI time and create security vulnerabilities. Multi-stage builds, layer caching strategy, non-root users, and minimal base images fix both — with real before/after comparisons.

Debugging

Git Mastery: The Commands and Workflows That Senior Engineers Actually Use

Beyond git add, commit, push — the git commands and workflows senior engineers reach for daily. Interactive rebase, bisect, reflog, worktrees, and the aliases that save hours every week.

JavaScript

React Performance Optimization: Every Technique From memo to Virtualization

React apps slow down for predictable reasons: unnecessary re-renders, missing memoization, unvirtualized long lists, and oversized bundles. Every technique to fix them — with when to use each.

System Design

Go Concurrency Patterns: Goroutines, Channels, and the Patterns Senior Engineers Use

Go concurrency is powerful and dangerous in equal measure. These goroutine and channel patterns — worker pools, fan-out/fan-in, context cancellation, errgroup — are what senior Go engineers actually use in production.

JavaScript

JavaScript Async/Await: Every Pattern, Pitfall, and Performance Trick

Async/await looks simple but hides deadly traps — sequential execution when you meant parallel, uncaught rejections, missing AbortController, await in forEach. Every pattern and pitfall covered.

Debugging

SQL Query Optimization: 15 Techniques That Turn Slow Queries Into Fast Ones

These 15 SQL optimization techniques are the difference between a 30-second report and a 200ms one — from reading EXPLAIN ANALYZE to covering indexes to replacing self-joins with window functions.

Python

Python Performance Secrets: 20 Techniques to Make Your Code 10x Faster

Python is slow only when you write it slowly. These 20 production-tested techniques make your Python code dramatically faster — from profiling to vectorization to multiprocessing.