Absolutely! JavaScript developers are fundamental to modern website construction. They can leverage HTML and CSS for structuring content and styling, while using JavaScript to make the website interactive and dynamic. From simple animations and form validations to complex single-page applications, JavaScript developers play a crucial role. They can also implement APIs for data handling and integrate third-party services. With the help of frameworks and libraries like React, Angular, or Vue.js, they can create reusable components, making the development process more efficient.