A developer is responsible for managing dependency injection in Android applications. They use the framework to generate and customize code, reducing runtime errors and enhancing code readability, maintainability, and reusability. They design app architecture, separating each component's dependencies and making them interchangeable. This allows for efficient unit testing and debugging. They also optimize performance by managing object lifecycles, reducing memory leaks and improving app speed. developers collaborate with other software professionals, ensuring the app’s functionality aligns with user requirements and business objectives. They continuously update their skills to stay abreast with latest updates.