A LiveScript developer is responsible for designing, developing, and implementing web applications using LiveScript, a functional programming language that compiles to JavaScript. Their tasks include writing clean, efficient, and reusable code, debugging programs, integrating user-facing elements developed by front-end developers, and ensuring optimal performance of the applications. They also test software to ensure responsiveness and efficiency, troubleshoot applications and system for issues, and maintain code integrity and organization. Additionally, they stay up-to-date with modern programming techniques and emerging technologies, and collaborate with team members to achieve project goals.