What design pattern would you use to decouple a complex system

Short answer: And why? The Mediator Pattern centralizes communication between components, preventing direct dependencies and reducing complexity. It promotes loose coupling and simplifies interactions. Alternatively, the Observer Pattern enables event-driven decoupling, and Facade Pattern provides a simplified interface to complex subsystems. Real-world… example…… (ShopNest) Patterns in ShopNest should solve a real pain…

Explain a bit more

(swappable payments, test seams)—not be added for decoration.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.