A short story about the horrors we had to face while working on someone else's code, how we managed to master ourselves and start simultaneously adding new features and slowly modernizing the old ones. About how to understand a week in four pages and why legacy is not always bad, but on the contrary — a great opportunity to pump yourself up.

This talk aims to highlight the latest features and tools in the Node.js ecosystem. Nikita will showcase new JavaScript/TypeScript constructs, explain use cases for the new features in Node.js v20, and provide insight into the rising popularity of various frameworks and tools. However, the main focus will be on providing insightful answers to critical questions: how, when, and most importantly, why these features should be used in product development.

We'll talk about running code that cannot be trusted and the additional difficulties in testing it. We will touch on both application and infrastructure solutions. And, of course, I will share real-life stories of situations where things went awry and about fire-fighting.