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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 Goo

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

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 ta

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, un

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

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 wa

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 so

At some point, a map project needs more than markers and polygons. You want something to happen on the map: water moving up a street, smoke drifting with the wind, or a shockwave spreading out from a

On 1 October 2026, Nigeria's postcode changed from six digits to an 11-character code that identifies a single building, such as EK-01-A03-FK-01. Language models trained before that date still describ

A print job, a one-time download, or a support attachment typically only needs to exist until someone finishes with it. But most backends still store it like Google Drive: a named object, no expiry, a