Hiring a Google Material Design Lite developer can greatly enhance your project's aesthetics and functionality. They are skilled in creating visually appealing, user-friendly interfaces that follow Google's design guidelines. This ensures a seamless user experience across different devices and platforms. Their expertise can help in improving your application's interaction design, navigation, and responsiveness, leading to increased user engagement and satisfaction. They also have a good understanding of web standards and SEO, which can boost your website's visibility and accessibility. Thus, their contribution can be crucial in creating a successful, high-quality web application.