Load Balancing Algorithms: Round Robin, Least Connections, and Consistent Hashing Compared
A caching layer distributes 10,000 keys evenly across four servers using a straightforward hash-and-modulo scheme, traffic grows, and the team […]
Database Indexing: How Indexes Actually Work, With Real Measured Numbers
Running the same lookup query against a 200,000-row table, once with no index and once after adding a single index
Database Indexing: How Indexes Actually Work, With Real Measured Numbers Read Post »
Random Secret & API Key Generator (Cryptographically Secure)
Using Math.random() to generate an API key or secret is a real, common mistake, since it’s not designed to be
Random Secret & API Key Generator (Cryptographically Secure) Read Post »
Rate Limiting Algorithms: Fixed Window, Sliding Window, Token Bucket, and Leaky Bucket Compared
An API sets a rate limit of 10 requests per minute, tests it by sending 10 requests and confirming the
GraphQL vs REST: Which Should You Actually Use?
A mobile app team notices their home screen makes seven separate API calls before it can render anything, some of
GraphQL vs REST: Which Should You Actually Use? Read Post »
WebSockets vs Server-Sent Events vs Long Polling (and Where WebTransport Fits Now)
For most of the last decade, “how do I get real-time updates into a web app” had a stable, three-answer
WebSockets vs Server-Sent Events vs Long Polling (and Where WebTransport Fits Now) Read Post »
Freelance Hourly Rate Calculator: What You Actually Need to Charge
The most common way freelance developers calculate their hourly rate is dividing a target annual income by 2,080, the number
Freelance Hourly Rate Calculator: What You Actually Need to Charge Read Post »
How to Price Freelance Development Projects: Hourly vs Fixed vs Value-Based
A freelance developer finishes a project two days faster than expected, feels genuinely good about it, invoices for the hours
How to Price Freelance Development Projects: Hourly vs Fixed vs Value-Based Read Post »
Conventional Commits Linter & Generator: Write Commit Messages That Actually Automate Something
Six months into a project, someone asks “when did we drop support for the old auth flow” and the answer
Semver Range Checker: Does This Version Actually Satisfy That Range?
A dependency pinned to ^0.4.2 in a package.json gets a minor version bump to 0.5.0, and suddenly a build starts
Semver Range Checker: Does This Version Actually Satisfy That Range? Read Post »
Unit vs Integration vs End-to-End Testing: What Should You Actually Write?
A team gets burned by a production bug, someone declares “we need more tests,” and three months later the codebase
Unit vs Integration vs End-to-End Testing: What Should You Actually Write? Read Post »
Webhook Signature Verification Tester: Stripe, GitHub, Shopify, and Generic HMAC
A webhook integration works perfectly in testing, ships to production, and then starts silently rejecting every real event with a
Webhook Signature Verification Tester: Stripe, GitHub, Shopify, and Generic HMAC Read Post »
Content Security Policy Generator: The Strict CSP Approach, Not the Outdated Allowlist
Search “CSP generator” and nearly every result produces the same thing: a form with checkboxes for script-src, style-src, and a
Content Security Policy Generator: The Strict CSP Approach, Not the Outdated Allowlist Read Post »
TypeScript vs JavaScript in 2026: Should You Actually Migrate?
For most of TypeScript’s existence, “TypeScript vs JavaScript” debates followed a predictable script. Someone would bring up the safety and
TypeScript vs JavaScript in 2026: Should You Actually Migrate? Read Post »
CORS Preflight Simulator: See Exactly What Headers Your Server Needs to Send Back
A POST request with a JSON body throws a CORS error in the browser console, and the instinctive reaction is
CORS Preflight Simulator: See Exactly What Headers Your Server Needs to Send Back Read Post »