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How to Implement PayPal in a Microservice Architecture Using NestJS, gRPC, and Docker

In this tutorial, you'll build a production-ready PayPal payment service using NestJS microservices. Along the way, you'll learn how to isolate payment logic...

Intro to Shaders: JavaScript and p5.js Course for Beginners

Are you ready to unlock the true rendering power of your computer and create breathtaking visuals? We just published a new course on the freeCodeCamp.org...

How to Build a RAG Chatbot for Your Docs with Node.js, Google Gemini, and pgvector

I was helping a team that had a 200-page API documentation PDF. Every new engineer spent their first two weeks Ctrl+F-ing through it, asking the same...

When It Makes Sense To “Block” The Main Thread

The common rule of thumb is to never “block” the browser’s main thread when running JavaScript tasks. But is this a hard rule? Victor Ayomipo describes a use case he encountered...

No, People Don’t Want More AI In Their Life

Many companies assume everyone craves new AI features. But the reality is that most people don't want more AI — at least not in the way most AI leaders envision it. Brought...

Play and design: in favour of the novel digital experience

Design used to let us wander; modernity replaced that wandering with efficiency — now, every product decides where you’ll end up before…Continue reading on UX...

What 32 design leaders do when told to move faster

The Greeks knew the answer to this problem, 2300 years agoContinue reading on UX Collective »

The terminal became my canvas

And it’s great… but horrible at the same timeContinue reading on UX Collective »

Design system contracts: the component lives in neither Figma nor code

The Observer Design Pattern Handbook: Event-Driven Architecture & Domain-Driven Design in Dart

Every application, at some point, has to deal with a fundamental challenge: something happens, and several other things need to react to it. A user logs in,...

AI just called design’s bluff

From vibe to specs: reclaiming the design process with SAID framework

Designing with web standards: The playbook for this AI moment

Master Full-Stack Mobile Development with React Native

Do you want to get into mobile development and build cross-platform applications? We just published a comprehensive new course on the freeCodeCamp.org YouTube...

How to Fix Common Web Application Security Vulnerabilities in Node.js

Here's something that tends to surprise developers who are new to security: most web vulnerabilities aren't the result of sophisticated attacks. They come...

A Beginner's Guide to Python: Hands-On Projects to Get You Coding

Have you been wanting to learn how to code but found it a bit too overwhelming or confusing? We just published a brand new course on the freeCodeCamp.org...

Understanding Dijkstra's Algorithm

In 1956, a young programmer was taking his girlfriend shopping in Amsterdam. Feeling tired, they sat down at a cafe terrace for a cup of coffee. In the 20...

Why "It Worked on My Machine" Still Happens in 2026

Every engineering team has said it at least once: "It works on my machine." The phrase has become a running joke in software, but it's rarely funny when it...

How I Used Harness Engineering to Make Our Company AI-Native

Most companies say they want to "adopt AI". In practice this usually means a chatbot bolted onto a website. Meanwhile, engineers using AI coding tools hit the...

How to Kiss a Cannibal

AI systems are demanding new interaction models. Are designers ready?

Designers are sharpening knives for the wrong fight