Kotlin is a new, expressive, general-purpose programming language powered by the same virtual machine technology that powers Java. Since Kotlin compiles to the JVM bytecode, it can be used side by side with Java, and it does not come with a performance overhead. In this article, Toptal Freelance Software Engineer Ivan Kušt gives us a walkthrough of 10 major features of Kotlin that help avoid boilerplate code and, more importantly, save time.