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MonkeyTips

Bite-sized, battle-tested engineering tips — with runnable code, diagrams and challenges.
Most tip content, techniques, and guidance steps are developed with AI assistance.
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Laravel Medium

Idempotency Keys: Preventing Duplicate Payments in Distributed Systems

Why idempotency keys matter in payment APIs, how to implement them safely with a database-backed store, and common pitfalls like race conditions and key collisions.

PHP 8.4
Diagram
4 min read · 21 Read tip
Database Hard

Database Deadlocks: Detection, Diagnosis, and Prevention

How relational databases detect deadlocks with wait-for graphs, why they happen, and concrete techniques to prevent them in high-concurrency systems.

Postgresql 13+
Diagram
5 min read · 102 Read tip
Database Hard

Distributed Locking with Redis: Understanding the Redlock Algorithm

A deep dive into the Redlock algorithm for safe distributed locking across multiple Redis nodes, including failure modes, clock drift, and the fencing token fix.

Redis 7.x
Diagram
6 min read · 237 Read tip
DevOps Medium

Git Interactive Rebase: Clean Up Your Commit History Before a PR

Learn how to use git rebase -i to squash, reorder, and edit commits so your pull requests tell a clean, reviewable story.

Git 2.40+
Diagram
4 min read · 264 Read tip
Database Medium

Redis Caching Strategies: Cache-Aside vs Write-Through

Compare cache-aside and write-through caching with Redis, including consistency trade-offs, TTL strategy, and when to use each pattern.

Redis 7.x
Diagram
4 min read · 218 Read tip
JavaScript Medium

TypeScript Utility Types: Pick, Omit, and Partial Explained

Stop duplicating interfaces for every slightly-different shape. Pick, Omit, and Partial let you derive new types from one source of truth — here's when to reach for each.

TypeScript 5.x
Diagram
3 min read · 231 Read tip
Security Medium

Rate Limiting APIs: Token Bucket vs Sliding Window

Fixed windows let clients burst 2x at the boundary. See how token bucket and sliding window rate limiting actually work, with Redis-backed implementations and the pitfalls that break them in production.

Redis 6.x+ Node 18.x+
Diagram
2 min read · 232 Read tip
Next.js Medium

Next.js App Router: Server Components vs Client Components

Server Components run only on the server; Client Components hydrate in the browser. See how Next.js App Router renders both, and when to actually reach for 'use client'.

Next 14.x - 15.x React 18.x - 19.x
Diagram
3 min read · 1,093 Read tip
JavaScript Medium

Debounce vs Throttle in JavaScript: Control How Often Code Runs

Scroll, resize, and keystroke events fire dozens of times a second. Learn how debounce and throttle rate-limit them — and which one to reach for.

JavaScript ES6+
Diagram
2 min read · 1,030 Read tip
Database Medium

Database Indexes: Turn a Full Scan Into an Instant Lookup

See why a query without an index scans every row, how an index turns it into a fast lookup, and how to read EXPLAIN to tell the difference.

SQL ANSI / MySQL 8+
Diagram Try the challenge
2 min read · 1,815 Read tip
PHP Easy

Preventing SQL Injection in PHP

Learn essential techniques to protect your PHP applications from SQL injection attacks.

PHP 8.0+
Diagram Try the challenge
2 min read · 986 Read tip
DevOps Medium

Docker Multi-Stage Builds for Smaller Images

Reduce your Docker image size dramatically using multi-stage builds.

Docker 20.10+
Diagram Try the challenge
2 min read · 2,169 Read tip
PHP Medium

PHP 8.4 Property Hooks Explained

Discover the new property hooks feature in PHP 8.4 that provides a cleaner way to add logic to property access.

PHP 8.4
Try the challenge
1 min read · 1,351 Read tip
Laravel Medium

Laravel Query Optimization with Eager Loading

Learn how to optimize database queries in Laravel by using eager loading to prevent N+1 query problems.

Laravel 11.x PHP 8.2+
Diagram Try the challenge
2 min read · 1,637 Read tip
JavaScript Easy

JavaScript Async/Await Best Practices

Master async/await in JavaScript with these best practices and common pitfalls to avoid.

JavaScript ES2017+
Diagram Try the challenge
1 min read · 2,136 Read tip