A Cross-Browser Developer is responsible for creating and maintaining websites or web applications that function seamlessly across multiple browsers. This involves ensuring compatibility with different browser types, versions, and operating systems. They identify and resolve issues related to browser inconsistencies, often using tools for testing and debugging. Their work is crucial for providing a consistent user experience regardless of the platform used. They also need to stay updated with the latest browser updates, web standards, and programming languages like HTML, CSS, JavaScript. Understanding responsive design principles to ensure mobile compatibility is also a part of their job.