An Apache Ambari developer is responsible for managing and monitoring Apache Hadoop clusters. They specialize in the installation, configuration, and management of Hadoop components, such as HBase, Hive, and HDFS. They utilize Ambari's simple, web-based interface to provision, manage, and monitor clusters. They also handle cluster validation, service management, and alert framework. They often work closely with data engineers, data scientists, and system administrators to ensure optimal cluster performance, security, and troubleshooting. In addition, they may also enhance Ambari's functionalities by developing and integrating new features, modules, or plugins.