5.3. L3: Production-Ready Applications

At this point, you know how to write code that works—and maybe even works well. But real-world software isn’t just about writing features. It’s about building systems that are reliable, maintainable, and scalable.

This chapter is about everything that happens after the code “runs on your machine.”

Welcome to the world of production-ready applications.

What Does “Production-Ready” Mean?

A production-ready application is one that can safely and confidently run in the real world—with real users, real data, and real consequences.

• If something breaks, you can find out why
• If traffic spikes, your system doesn’t fall over
• If a teammate makes a change, it doesn’t take the whole system down