Learn Modern Kotlin
We just published a comprehensive, free Kotlin course on the freeCodeCamp.org YouTube channel. Whether you're targeting Android development, scalable backend...
Beau Carnes - freecodecamp
Mobile
Security
The Engineering Anatomy of API Vulnerabilities: A Deep Dive into the OWASP API Security Top 10
Most security articles read like threat reports. They describe vulnerabilities from the outside looking in: what an attacker does, what the impact is, and how...
Oluwaseyi Fatunmole - freecodecamp
Other
API Authentication & Authorization: An Engineering Deep Dive into Mechanisms, Trade-offs, and Failure Modes
Every API has some form of authentication. But having authentication and getting it right are two completely different things. I've reviewed production...
Oluwaseyi Fatunmole - freecodecamp
How to Break the AI Coding Agent Fix Loop
You've likely seen this movie before: something breaks in an app you built with an AI coding agent. You ask the agent to fix it. It "fixes" it. But the bug is...
Amir Gabay - freecodecamp
How to Use NestJS Observe: An Observability Handbook for Devs
Observability isn't a new problem, and NestJS is certainly not the first ecosystem to tackle it. But NestJS Observe is interesting because it asks a more...
Pacifique Linjanja - freecodecamp
How AI Is Changing Email Deliverability: A Technical Guide to Sender Reputation and Inbox Placement
Sending an email doesn't always mean it will reach the recipient's inbox. Sometimes, an email is sent successfully by an application but ends up in the spam...
Reetain Raina - freecodecamp
How to Avoid JNI Crashes by Managing Local and Global References Correctly
Most JNI crashes don't come from complicated logic. They come from a small set of mistakes around object references: holding on to a reference after it has...
Nikheel Vishwas Savant - freecodecamp
How to Submit a Quarterly Update to HMRC's Making Tax Digital API
Four times a year, every sole trader and landlord in Making Tax Digital (MTD) for Income Tax has to send HMRC a summary of their income and expenses. The...
Solomon Amos - freecodecamp
How to Separate Operational Intent from the Executor
In my previous article, I argued that software automation needs a layer between operational intent and execution. The reason is simple: the specification...
Hugo Teijiz - freecodecamp
How to Build an AI Support System That Automatically Routes Bugs to GitHub with Next.js and Jev
Every website gets feedback, and most of it ends up somewhere awkward. A visitor finds a broken button and emails you. Someone else leaves a comment on social...
Andrew Baisden - freecodecamp