Yes. Kotlin is supported as a first-class language on Android . There are hundreds of applications already using Kotlin for Android, such as Basecamp, Pinterest and more.
Read moreCan Kotlin be used for backend?
When you start to work with Kotlin on the backend, you have several options at your disposal . If you choose to use a library written in Kotlin, you get some major advantages: there will be no compatibility issues related to the language you use since everything is written in Kotlin.
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