Building a Fault-Tolerant Node.js Backend: 4 Patterns I Applied to My Ticketing App

While building iTicket.AZ — a real-time event ticketing platform — I came across a job posting from a major bank that listed "building scalable, resilient, and fault-tolerant applications" as a core requirement. That made me think: is my backend actually fault-tolerant? Spoiler: it wasn't. Here's what I changed. What does "fault-tolerant" actually mean? A fault-tolerant system keeps running — even in degraded form — when parts of it fail. That means your app doesn't crash just because the databa