WOONGJIN, Inc. is seeking a skilled Java Developer to maintain and troubleshoot existing portal systems, develop and implement enhancements and updates, and analyze business and system requirements to ensure technical feasibility. The role involves designing and developing software using Java, Maven, Spring Framework, and Oracle, while collaborating with internal stakeholders and external vendors to provide technical direction and support. The successful candidate will write clean, efficient, and testable code, ensure quality and stability through code reviews, unit testing, and debugging, and support deployment, integration, and ongoing system reliability.