An Asterisk-Java API developer designs, develops, and maintains Java applications that interact with the Asterisk PBX server. They utilize the Asterisk-Java API to manage calls, conferences, queues, and interact with the Asterisk Manager Interface (AMI) and the Asterisk Gateway Interface (AGI). They write robust, efficient code, troubleshoot issues, and optimize performance. They might also create user interfaces for Asterisk applications, integrate with other systems, and ensure the security of the applications. Their work enables features like automated call distribution, interactive voice response, and more, in telephony systems. They also document their work and may provide technical support.