During October 2025, Matistjati focused on improving the cpinitiative/usaco-guide repository by addressing a bug related to dead Kattis problem URLs. By carefully identifying and correcting broken links, Matistjati enhanced the reliability and accessibility of problem sets for users. The work involved disciplined code maintenance, validation of link integrity, and repository quality assurance, all managed through a clean, traceable commit process. Leveraging skills in data management, web development, and working with JSON, Matistjati’s targeted fix reduced user confusion and support inquiries. This contribution resulted in smoother navigation and improved onboarding for users accessing problem-solving resources within the repository.