Features of Kotlin:

Expressiveness: It uses features like type-safe builders and delegated properties which uses the concept of abstraction.

Scalability: It allows a developer to develop such applications which can support a large number of user with modest hardware requirements.

Interoperability: Kotlin can be used with java based frameworks.

Migration: A old system written in java can be converted into kotlin based system.

Tools: Good tools like IntelliJ Ide is available there for its programming.

Frameworks for server-side programming:

There are many server-side frameworks for kotlin for instance spring,ktor and etc.

Where to deploy your application:

There are many options are available there for example google cloud, Amazon, and Heroku.