Hiring a JavaCC developer is beneficial as they possess expertise in parsing technology used in various applications, like compilers, interpreters, and software for complex data analysis. They can generate parsers in Java, simplifying the process of creating machine-readable input. With their knowledge in Java language, they can develop robust, secure, and high-performance applications. Their ability to handle syntax errors and build predictive parsers makes them indispensable for projects requiring complex language processing. This makes a JavaCC developer a valuable addition to your team.