In the ever-evolving landscape of technology, it comes as no surprise that the process of hiring an iOS App Developer can be riddled with complexities. While it may seem overtly simplistic to simply peruse through resumes and portfolios, the reality is far from it. From my own experiences, I've distilled knowledge that I wish had been imparted upon me before embarking on this endeavor.

Our first point of consideration revolves around a term that has been bandied about in the tech sphere for quite some time - "full stack" development. It refers to a developer's proficiency in both front-end (the user interface) and back-end (the server side) development. This skillset is a desirable attribute in an iOS App Developer. However, the caveat is that the complexity of applications today often requires specialized skills. A developer claiming expertise in all aspects of app development might lack the depth of knowledge needed for your specific project. Therefore, assessing the requisite skill level based on your project requirements becomes pivotal. For instance, if your application involves complex server-side operations, a developer with a proven track record in back-end development would be more suitable than a Jack-of-all-trades.

Secondly, let us delve into the field of programming languages. Swift and Objective-C are the principle languages for iOS development. However, a shift towards Swift is evident, primarily due to its simplicity and less error-prone nature. While hiring, it's crucial to understand that a developer proficient in Swift may not be as adept in Objective-C, and vice versa. This is akin to the tradeoff between specialization and generalization in economics. An in-depth proficiency in one language may come at the expense of breadth across multiple languages.

The third point to consider is the importance of understanding app architecture. In simple terms, app architecture refers to the method of structuring an app's code. It involves patterns such as MVC (Model-View-Controller), MVP (Model-View-Presenter), and MVVM (Model-View-ViewModel), each with its own set of pros and cons akin to a game of chess, where each move has strategic implications. A developer who lacks a solid understanding of these architectures may produce disorganized code, leading to an app that is difficult to debug, update or scale. It's therefore crucial that your developer is familiar with these architectural patterns and can choose the most suitable one based on your app's requirements.

Finally, let's touch upon the aspect of UI/UX design. While primarily the domain of designers, it's essential that your iOS App developer has a firm grasp of the principles of User Interface (UI) and User Experience (UX) design. This pertains to the app's design, its usability, and the overall user experience. A developer who can code but lacks an understanding of good design principles might produce a technically sound app that is, however, unengaging or confusing for users. This runs parallel to a theorem in mathematics, where a solution might be theoretically correct but practically infeasible.

In conclusion, while the process of hiring an iOS App Developer is complex and layered, it's not insurmountable. By understanding the requisite skills, the languages, the importance of app architecture, and the necessity of a grasp of UI/UX principles, you are better equipped to choose the right developer for your project. Remember, it's not about finding a developer with the most skills, but finding the right developer with the right skills for your specific project. As Socrates once said, "The only true wisdom is in knowing you know nothing." This humility and openness to learn will serve us well as we navigate the often-turbulent waters of app development.