A JBoss developer designs, develops, and maintains applications on the JBoss Enterprise Middleware platform. They use Java and technologies to build enterprise-grade server applications and services. They are responsible for managing JBoss infrastructure, including configuration, deployment, and troubleshooting. They also ensure the performance, security, and availability of applications. They may also work with databases, web services, and APIs. Furthermore, they collaborate with other developers and stakeholders to understand requirements, design solutions, and resolve technical issues. They often use tools like Maven, Ant, and Jenkins for build and continuous integration processes.