A Java Web Services developer designs, implements, and maintains web applications using Java programming language. They develop server-side components, connect applications with other web services, and support front-end developers by integrating their work with the application. They are also responsible for managing Java and Java EE application development, ensuring designs comply with specifications. They contribute in all phases of the development lifecycle, including writing well-designed, testable, efficient code. They prepare and produce releases of software components, and support continuous improvement by investigating alternatives and technologies. Additionally, they often participate in software architecture and design decisions.