In this tutorial, I'll show you how to build a multi-agent AI system in Python with no orchestration framework. We'll also implement this in LangGraph with nodes, edges, and shared state. The point of

Today, diffusion models power some of the most impressive AI systems ever built. They generate photorealistic images, create videos, synthesize speech, design proteins, and increasingly influence fiel

A randomized A/B test is the cleanest form of product experiment available. The coin flip that splits users between the new prompt template and the control removes every possible confounder by constru

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 questions in Slack, getting redirected to the same

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 opposite wall. The AI writes code fast, b

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 happens in production. A feature passes ever

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 from code patterns that look completely reaso

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 minutes it took to finish their drinks, he co

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 channel that will teach you how to build

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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, and the app needs to save a token, cache th

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 into its own service, communicate between

For the past 10 years, we've experienced a massive improvement in translation technologies. We went from robotic-like translations to systems that not only understand the meaning of each word in a sen

Every fast-growing engineering team eventually hits the same wall. A developer needs a new staging environment, so they file a ticket. The platform team queues it. Two weeks later, the environment exi

PDF documents are frequently used to share invoices, contracts, reports, legal records, customer documents, financial statements, and internal business files. But before these documents are shared, th

Creating pop-ups and modals on your site can be a complicated process. And it often requires a lot of boilerplate code to get started. But the real challenge comes when you want to make that modal or

In this tutorial, I'll show you how to evaluate a local AI agent with a simple, repeatable evaluation harness. The harness runs the agent against a set of test cases, checks the results with both rule

Last year a client called me about exactly this. Someone ran git log -p on a hunch and found a .env committed two years earlier, never caught. Database password, Stripe secret, JWT signing key — all s

Software engineers often think reliability is a modern challenge. We discuss uptime, distributed systems, observability, and fault tolerance as if they belong exclusively to cloud computing. In realit

It's mid 2026, and the best frontier models out there still hallucinate. I want you to gain two things from reading this article: understanding that AI hallucinations are still real and possibly harmf