How do you design a scalable iOS architecture for large applications?

A scalable iOS architecture uses modular layers, clear boundaries, and dependency inversion.

Scalability in iOS architecture comes from separating concerns into independent modules such as Presentation, Domain, and Data layers. Each module should communicate through well-defined interfaces. Dependency Inversion ensures higher-level modules are not tightly coupled to lower-level implementations. This allows teams to work in parallel, improves testability, and reduces build time in large codebases.