Yoda Response: Limited experience with Kotlin, I have. Primarily, my work has been with Java and C++. However, a few minor changes in Kotlin, I have made. 

To ensure code efficiency and maintainability, best practices I follow. Code reviews, unit tests, and adhering to coding standards, I do. Even in brief encounters with Kotlin, these principles, I apply. 

For Java and C++, extensive experience I have, and similar practices I follow to ensure high-quality, maintainable code.