A CSS/SASS developer is essential for creating visually appealing and user-friendly websites. They ensure your site is responsive, functional, and consistent across different browsers and devices. With their expertise in SASS, they can write clean, reusable, and maintainable CSS code, making your site easier to manage and update. They also understand the best practices for site speed and performance, SEO, and accessibility, which can significantly enhance user experience and your website's visibility. A skilled CSS/SASS developer can turn your design vision into reality, encouraging more engagements and conversions.