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Authentication asks "who are you?" Authorization asks "what can you do?" Confusing them leads to security vulnerabilities that are easy to miss and hard to find.

Event-driven architecture decouples services by having them communicate through events rather than direct calls. Here's when it helps, when it doesn't, and how to think about it.

Suspense has been in React for years, but its data-fetching story is finally stabilizing. Here's what it is, how it works, and when it's the right tool.

N+1 is one of the most common performance bugs in backend development. It's subtle, easy to introduce, and can turn a fast endpoint into a slow one as data grows.

CORS errors are one of the most common frustrations in web development. Here's how the browser's same-origin policy works, and how CORS solves it.