Hiring an ANTLR developer is beneficial for creating custom programming languages or domain-specific languages. They can design and implement efficient grammars for parsing, interpreting, or compiling. ANTLR developers can also provide solutions for translating, analyzing, or transforming structured text data. Their expertise can significantly improve your software's flexibility, readability, and maintainability, thereby enhancing its overall quality and performance. Furthermore, their skills can be valuable in addressing complex computational problems and language processing tasks, which can be crucial in fields like data science, artificial intelligence, and more.