A Flutter Developer is a software developer skilled in using Flutter, an open-source UI framework by Google, to create cross-platform mobile, web, and desktop applications from a single codebase. Flutter developers use Dart, the programming language used by Flutter, to build high-performance, visually appealing, and responsive applications.

Their tasks include designing user interfaces, developing custom widgets, integrating APIs, managing app state, and ensuring smooth performance across platforms such as iOS, Android, and web browsers. Flutter developers also focus on ensuring apps are optimized for speed, security, and scalability.

These developers are ideal for businesses or individuals looking to build high-quality mobile applications that can run on multiple platforms without the need to develop separate apps for each operating system.