I have limited experience with Kotlin, as my primary focus has been on Java and C++. However, I have made a few minor adjustments in Kotlin. 

To ensure code efficiency and maintainability, I adhere to best practices. I conduct code reviews, write unit tests, and follow coding standards. Even in my brief experiences with Kotlin, I apply these principles. 

I have extensive experience with Java and C++, and I implement similar practices to guarantee high-quality, maintainable code.