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How would you scale up a social photo browsing app with an infinite scroll, to millions of concurrent users?

Design the architecture of a file manager app for iOS

Design the system for the iOS Calendar appI would appreciate it if you could develop a UI that resembles the iOS calendar. Your task is to create a custom layout for the collection view, particularly focusing on the frameForCellAtIndexPath method. This method is responsible for calculating the frame for each cell in the collection view.

What makes OperationQueue different from GCD?

Detail your approach for building a highly scalable photo sharing app that can support a rapidly increasing number of users.

Propose a design for a real-time social newsfeed in an iOS app.

Break down the memory management process in iOS, specifically focusing on the functioning of Automatic Reference Counting (ARC). Elaborate on the benefits it brings to the table.

How would you manage async tasks in an iOS app?

Design an alarm clock app for the iPhone

We need you to come up with a method to rotate a given square matrix in a clockwise direction, making sure to do it in place without creating a new matrix.