What to Do When Your Constants Are Someone Else's Law
Javeed Shaik |
A colleague once asked me why a number in my code had a comment three lines long. The number was 18. The comment said which rule it came from, which section notified it, and that it could change witho... read more
How to Measure Conformance Between an Operational Specification and Its Execution
Hugo Teijiz |
In my previous article, I explored executor independence: the idea that different execution mechanisms should be able to satisfy the same operational specification. By executor independence, I mean th... read more
How to Add Structured Data (JSON-LD) to a Next.js Site and Validate It
Saar Twito |
Structured data has always mattered to search engines. When a search engine reads your page, it sees HTML: a heading, some paragraphs, a date somewhere, a name somewhere else. Structured data tells it... read more
Create Scalable AI Automations with n8n
Beau Carnes |
Most automation tutorials show you how to connect two simple apps and call it a day. But building workflows that companies can actually run in production requires an entirely different skill set, one... read more
Master Modern React Routing: TanStack Router Crash Course
Beau Carnes |
Routing in modern web applications has evolved far beyond simply rendering a component based on a URL path. Developers today want end-to-end type safety, automated code splitting, seamless URL search... read more
How to Create System Design Diagrams using Python
Zaira Hira |
Creating system architecture design diagrams is an important part of technical documentation. As system complexity grows, clarity within teams becomes even more important. But creating diagrams from s... read more
Build and Train a 25M Parameter LLM From Scratch on Your CPU
Beau Carnes |
You don't need a massive GPU cluster to learn how modern frontier AI works. In our new video on the freeCodeCamp.org YouTube channel, you will build, pre-train, and fine-tune a working 25-million para... read more
What Claude Code Can and Can't Do with Full Access Inside a Docker Sandbox
Chirag Agrawal |
Claude Code can do more than suggest a fix. It can edit files, install dependencies, run tests, and start your application. But letting it finish a task on its own raises a practical question: how muc... read more
How to Encrypt PII in Data Pipelines While Keeping It Searchable
Lakshmi Mahabaleshwara |
At Intuit, my team built a data pipeline that processed TurboTax e-filing data. This data needed to be made available for dashboards, analytics, and other downstream use cases. One of the biggest chal... read more
API Authentication & Authorization: An Engineering Deep Dive into Mechanisms, Trade-offs, and Failure Modes
Oluwaseyi Fatunmole |
Every API has some form of authentication. But having authentication and getting it right are two completely different things. I've reviewed production systems where JWTs had no expiry. Systems where... read more