Hiring a Modernizr developer can significantly enhance your web development process. Modernizr is a JavaScript library that detects and features in user's browsers. A developer skilled in this can create a more responsive, user-friendly website that functions well across various browsers. They ensure that new and older technologies coexist, optimizing user experience regardless of the device or browser used. Their expertise can help in identifying and resolving compatibility issues swiftly, thereby saving time and resources. Therefore, a Modernizr developer is a valuable addition to any web development team.