A JBoss Developer is responsible for designing, developing, and maintaining applications using JBoss Enterprise Middleware. They are skilled in Java programming and use JBoss application server to build software solutions. Their tasks include setting up JBoss systems, deploying applications, troubleshooting, and ensuring high performance and availability. They work on integrating applications, securing them, and managing transactions. They also collaborate with other team members to design and optimize code, implement software enhancements, and fix bugs. They maintain documentation of all work done and often need to stay updated with new technologies and industry trends.