Networking is the backbone of almost every modern iOS application. However, as projects grow in complexity, the network layer often becomes a “junk drawer” for URL construction, messy completion handlers, and scattered error logic. This tight coupling makes unit testing difficult and maintenance a nightmare.
In this article, we are going to build a reusable, testable, and type-safe Network Layer from scratch. By leveraging Clean Architecture principles, the power of Swift Generics, and the modern elegance of Async/Await, we will create a solution that separates concerns and scales with your app.