A JBuilder developer uses the JBuilder integrated development environment (IDE) for building Java applications. They write, debug, and test code to create software that meets specific requirements. JBuilder developers often work on creating user interfaces, server-side components, and database interactions. They also optimize and refactor code for efficiency. Their role includes collaboration with other developers, software architects, and project managers to ensure the application aligns with the project objectives and customer needs. They may also be involved in maintaining documentation and resolving any issues that arise post-deployment.