Responsibilities: Participate in the development of enterprise-grade web applications using Spring / Spring Boot frameworks Write efficient, maintainable, and scalable backend business logic Design, develop, and maintain RESTful APIs to ensure stable system integration and high concurrency performance Work with relational databases (e.g., MySQL, PostgreSQL), including schema design and SQL performance optimization Write unit and integration tests to improve code reliability and coverage Collaborate in Agile/Scrum development processes to deliver tasks and drive project progress Support system deployment, post-launch operations, and issue troubleshooting Continuously learn and apply DevOps tools and cloud service practices (e.g., Jenkins, GitLab CI/CD, AWS)