A Java developer is a skilled professional who specializes in programming using the Java programming language. They are responsible for designing, developing, and maintaining Java-based applications, software, and systems. Java developers work on a wide range of projects, from web and mobile app development to server-side applications. They use Java's robust libraries and frameworks to create efficient and scalable solutions. Java developers need strong problem-solving skills, a deep understanding of object-oriented programming principles, and proficiency in Java-related technologies such as Spring, Hibernate, and Java EE. They also collaborate with cross-functional teams to ensure software projects meet client requirements and industry standards.