A ClojureScript developer offers versatility and efficiency in creating robust web applications. They bring a functional programming approach, promoting clean and easily maintainable code. ClojureScript's interoperability with JavaScript and its libraries ensures seamless integration with existing technologies. Its immutable data structures facilitate concurrent processing, enhancing application performance. The developer's adeptness with REPL (Read-Eval-Print-Loop) enables rapid prototyping and debugging. Through ClojureScript, you get a performant, scalable solution with shorter development cycles.