Chanjin focused on enhancing the developer experience in the spring-security repository by improving core module documentation and Javadoc. Over the course of a month, Chanjin delivered targeted cleanups that removed Javadoc warnings, fixed invalid references, and clarified API usage, particularly around AuthorizationManager and RoleHierarchyUtils. Working primarily with Java and Gradle, Chanjin updated package-level documentation and refined method descriptions to make the API more discoverable and easier to onboard for new contributors. The work emphasized code quality and maintainability, resulting in clearer documentation that supports both ongoing development and future code reviews within the Spring Security project.