Hiring a Browserify developer is beneficial as they have the expertise to bundle your JavaScript files and modules to run directly in the browser, improving efficiency. They enable you to write modular code, which is easier to manage, debug, test, and reuse. They also have the ability to leverage a vast number of NPM packages directly in the browser. Additionally, Browserify can handle dependency resolution, making it easy to include and manage external libraries. Their skills can lead to better structured, maintainable, and scalable code, enhancing your web development process.