Worked on backend development for the DSpace/DSpace repository, focusing on improving system stability by addressing a specific runtime issue. Delivered a targeted bug fix in the Access Status Helper, where a null check was added during resource policy filtering to prevent potential NullPointerExceptions when a group object could be null. This adjustment enhanced the reliability of access status evaluations across various policy configurations, reducing the risk of runtime errors in production environments. The work was implemented using Java and demonstrated attention to defensive programming practices, ensuring more robust backend logic without introducing new features during the development period.