The Kotlin programming language is on many of our developers' bucket lists to assess this year, and some have already used it successfully in production. It is an open source JVM language from JetBrains. Our Swift mobile developers like it as it is syntactically closer to Swift and equally concise. Our Java developers have enjoyed its seamless interoperability with the Java language and tools and found it easier to learn than Scala. Kotlin supports functional programming concepts but with less features than Scala. Developers on our teams who like static typing with the compiler catching null pointer defects found themselves writing fewer boilerplate tests.