Kotlin, a programming language released by JetBrains in 2011 and officially supported by Google in 2017, has quickly become the preferred choice for building Android apps. This study explores how Kotlin solves common developer issues such as long code, frequent Null Pointer Exceptions, app crashes, and UI delays. With features like safe null handling, compact code structure, coroutines, and compatibility with Java, Kotlin improves development speed, enhances app stability, and supports better architecture, making it a better option for future and cross-platform mobile development. Keywords: Android, Kotlin, Mobile App Development, Null Safety, Coroutines, Jetpack, Scalability.