Writing maintainable and scalable code is essential for the long-term success of any project. In my role, I have implemented several practices to ensure that our Java and Kotlin code for Android applications remains clean, maintainable, and scalable.

1. **Coding Guidelines:** I have established a set of coding guidelines for my team to follow. These guidelines include naming conventions for variables and methods, which help maintain consistency throughout the application. Consistent naming enhances code comprehension and makes it easier for new team members to get up to speed.

2. **Code Complexity Management:** We utilize tools like Android Studio's code complexity plugins to monitor the cyclomatic complexity of our methods. By keeping the complexity below a certain threshold (e.g., 10), we ensure that our methods remain simple and easy to understand. For example, instead of using multiple if-else statements, we prefer switch-case statements to handle multiple conditions, which helps reduce complexity.

3. **Clean Code Practices:** We prioritize writing clean code by avoiding unnecessary variables and ensuring that our code is free of commented-out sections. Each method and class is well-documented using JavaDoc, which explains its purpose and functionality. This documentation is invaluable for future maintenance and for any developers who may work on the code later.

4. **Modular Design:** We design our applications in a modular way, breaking down functionality into smaller, reusable components. This approach not only makes the code more manageable but also allows us to scale the application more easily by adding new features without affecting existing ones.

5. **Code Reviews:** Regular code reviews are an integral part of our development process. These reviews help identify potential issues early and ensure that the code adheres to our established guidelines. They also foster a culture of continuous improvement and knowledge sharing within the team.

6. **Client-Specific Guidelines:** In addition to our internal guidelines, we adhere to any coding standards provided by our clients. This ensures that our code meets their specific requirements and expectations.

By following these practices, we ensure that our codebase remains robust, maintainable, and scalable, facilitating easier updates and enhancements in the future.