Swift iOS App Architecture Refactor — MVC to MVVM or TCA

I will refactor a targeted module or feature area of your iOS application — migrating from a tangled MVC implementation to a clean MVVM, MVP, or The Composable Architecture (TCA) pattern — improving testability, separating concerns correctly, and producing a target-architecture reference implementation your team can use as the template for migrating the rest of the codebase. Massive View Controller syndrome is the most common iOS architectural problem; ViewControllers that contain networking calls, business logic, and data persistence alongside their layout code are simultaneously the hardest to test, the hardest to change, and the most likely to harbour subtle bugs from unintended coupling.

The refactoring scope covers one complete feature module — decomposing the existing ViewController into a ViewModel with published state (MVVM) or a Reducer with isolated state management (TCA), extracting networking into a protocol-based service, extracting persistence into a repository, and rewriting the View layer to observe the ViewModel or Store. Full unit test coverage of the ViewModel or Reducer is included, demonstrating the testability improvement the architecture delivers. An architecture document and migration guide for the rest of your codebase is included.

Designed for iOS development teams whose codebase has outgrown MVC and who need an expert-led reference implementation to align the team on the target architecture before undertaking the broader migration.