This guided lab walks you through migrating a small payments app, with a React UI and Express API running on a single AWS EC2 instance, while PostgreSQL stays on AWS. You’ll move the UI and API to Google Kubernetes Engine without changing the public URL customers already use, gradually shifting traffic from AWS to GKE […]
Daily Archives: October 17, 2026
A good final answer doesn’t prove that an agentic AI workflow was correct. This book develops a code-backed method for verifying execution and business outcomes from authoritative state and using that evidence to gate releases. You’ll find a runnable offline agent that demonstrates the core techniques. Chapter 19 distinguishes implemented capabilities from live-model and production […]
Artificial intelligence models like GPT-4 and Claude require massive, highly complex physical infrastructure. We just published a new full-length course on the freeCodeCamp.org YouTube channel that takes you deep inside the data centers powering the AI revolution. This course traces the entire journey of electricity from the utility grid all the way down to the […]
System design is one of the most important skills for software engineers today. Whether you’re applying for senior or staff-level positions or just looking to level up your architectural knowledge, understanding how to design systems at scale is a deciding factor for top tech companies. To help you master these concepts and pass your interviews, […]
Every team that ships software eventually builds a staging environment. And every team that builds a staging environment eventually discovers the same problem. Staging is shared. One environment, many pull requests. Someone deploys a half-finished feature to test it. Someone else deploys on top of that. A third person runs a database migration. By Thursday […]
Our on-call team keeps a small internal notes API. The web app in front of it shows who’s holding the pager, which days are frozen for deploys, and where the runbooks live. A developer on that team wanted the same search from Cursor, without opening the web app. They set it up the way most […]
There’s a conversation that happens in most engineering teams,maybe usually too late. Think of this, a feature ships to production. A security review happens afterwards, or a penetration test finds something, or worse, an incident report lands in your inbox. The vulnerability is real. The fix is expensive. And somewhere in the conversation, someone says […]