How to Build Type-Safe APIs with Hono and Zod
If you've shipped a Node.js API before, you already know this pain: your TypeScript types say one thing, your runtime validation says another, and your...
Chinedu Otutu - freecodecamp
Development
Design
Chain of Responsibility Design Pattern: Decoupling Complex Business Rules, One Handler at a Time
Every system, at some point, ends up with a function that nobody wants to touch. It starts small: a simple validation check, an if statement here, another...
Oluwaseyi Fatunmole - freecodecamp
Mobile
Mobile Background Execution: iOS Background Modes, Android WorkManager, and Background Services in Dart
Every mobile developer eventually hits the same wall: the app works perfectly when the user is looking at it. But the moment they press the home button,...
Oluwaseyi Fatunmole - freecodecamp
Other
How to Build Referral-Aware Split Payment Flows in Django
When a product has a single checkout, payment logic is usually simple: charge the user, mark the order as paid, and move on. But once the business model...
Chidozie Managwu - freecodecamp
How to Test Conversational AI: A Practical Guide for QA Engineers
When I first started learning about conversational AI testing, one question kept bothering me: Where is the expected result? Coming from traditional software...
GAYATHRI BOLINENI - freecodecamp
How to Convert Prometheus Histograms to OTLP with the OpenTelemetry Collector
Modern applications often expose metrics at a /metrics endpoint using the Prometheus format. Among these metrics, histograms are particularly useful. They...
Purity Udeh - freecodecamp
Neural Networks Explained: What They Are and How to Build One in Python
Have you ever wondered how a computer can recognize a handwritten number, predict whether an email is spam, recommend a video, or understand a sentence? A lot...
Eva J Patel - freecodecamp
How to Host Odoo: Self-Hosted vs Managed Hosting
Odoo is an open-source enterprise resource planning (ERP) platform that helps businesses manage operations such as sales, customer relationship management...
Abdul Talha - freecodecamp
How to Understand a Legacy Codebase Using AI Before Changing it
The first thing many engineers want to do when they inherit a legacy codebase is change it. And I understand the impulse. You open a class that's 1,500 lines...
Hugo Teijiz - freecodecamp
Kubernetes Networking Explained: From ClusterIP to Cilium Service Mesh
Here's something that most Kubernetes tutorials won't tell you: most engineers can run kubectl expose. Fewer than 10% understand what happens when they do....
Ayobami Adejumo - freecodecamp