How do you organize module separation in the latest large multi-tier system you worked on?

When organizing a modular architecture in a large multi-level system, I usually adhere to the following principles:

• Separation by functionality: each module is responsible for a specific business logic or layer (e.g., network, database, UI).
• Clear interfaces: modules interact through well-defined APIs, reducing coupling.
• Isolation of dependencies: minimizing dependencies between modules so that changes in one do not affect others.
• Use of Gradle modules: in Android projects, each module is a separate Gradle module, which speeds up build times and improves scalability.

For example, in a project, the network part (network), data layer (data), business logic (domain), and UI (app) were separated. Each module had its dependencies and provided interfaces for interaction with others.