A Custom Views developer primarily designs and implements user interface components for both mobile and web applications. They work extensively with programming languages like Java or Swift to create custom views that enhance user experience. These developers often collaborate with UI/UX designers to understand their requirements and translate them into code. They have a deep understanding of layouts, user interface elements, and custom animations. They also ensure the custom views are efficient and adaptable to various screen sizes, while maintaining optimal performance. Additionally, they troubleshoot and resolve any issues related to custom views.