A Cross-browser Compatibility developer ensures your web application or website functions optimally across various browsers, providing a consistent user experience. They have a deep understanding of different browser specifics, including their rendering engines and compatibility issues. This expertise is crucial because users access your site through numerous browsers, and any functionality discrepancies can negatively impact user experience, and subsequently, your business. Hiring a dedicated developer for cross-browser compatibility can help you avoid these issues, boost customer satisfaction, and increase the overall reach and accessibility of your website.