A JavaSE developer designs and implements applications using Java Standard Edition (SE) platform. Their duties involve writing clean, testable code that runs efficiently and optimally. They work on the development of server-side logic, ensuring high performance and responsiveness. They integrate user-facing elements into applications, handle data storage solutions, and fix bugs. They also collaborate with other team members to define, design, and ship new features. Their role requires a deep understanding of JavaSE, including its strengths and weaknesses, to produce optimized coding solutions. They may also be involved in maintaining code quality, organization, and automation.