A Java OOP (Object-Oriented Programming) Developer designs, implements, and maintains Java applications to meet business requirements. They use object-oriented principles to create reusable code and modular programs, reducing complexity and enhancing efficiency. They develop user interfaces, write well-designed and efficient code, conduct software analysis, testing, and debugging. They also participate in code reviews to ensure code quality, adhere to coding standards, and follow the software development life cycle. They often collaborate with other developers, business analysts, and stakeholders to ensure software solutions meet user needs. They also troubleshoot and resolve software defects and provide technical support when necessary.