Is the same technology stack used throughout the application architecture?

In application architecture, it is not necessary to use the same technology stack throughout all its parts. Often, different components can use different technologies that are optimal for their tasks.

For example, in an iOS application, the client side is written in Swift or Objective-C, while the server side can be implemented in Node.js, Java, or Python. This allows using the best tools for each task and increases development flexibility.

However, it is important that components can interact effectively with each other through APIs, protocols, and data formats.