A Java software development developer designs and implements applications and software using Java programming language. They create algorithms, write codes, debug errors, and ensure smooth software operations. They conceptualize and analyze software programs, integrate user-interfaces, and manage databases. They use frameworks like Spring, Hibernate, or Struts, and work with web technologies like HTML, CSS, JavaScript, and jQuery. They also collaborate with other developers and stakeholders, participate in testing and maintenance processes, and often document their work for reference and reporting. Moreover, they continually update their knowledge on new technologies and methodologies to enhance software performance.