A Gradle developer is responsible for managing and controlling software builds and dependencies. They utilize Gradle, a powerful open-source build automation system, to write scripts that automate processes like testing, deployment, and generating documentation. They design and implement build scripts using Groovy or Kotlin DSLs, ensuring the smooth integration of software components. They also maintain build environments, troubleshoot build issues, and optimize build performance. Additionally, they work collaboratively with software developers to build and test applications in a consistent and reliable manner, thus contributing to the overall efficiency and quality of software development.