How I extended NestJS's architecture for projects that outgrow the basics

NestJS ships with a great starting point. The module/controller/service pattern is clean, approachable, and gets you productive fast. For most projects, it's exactly what you need. But as a project grows - more features, more teammates, more complexity - that foundation benefits from a bit more structure. Not a full rewrite, not a completely different paradigm. Just a few extra layers with clearly defined responsibilities. This is what I came up with, and why. The challenge with scaling the defa