Mihajlo Katancevic developed foundational documentation and policy features for filesystem libraries in the qorix-group/score and eclipse-score/score repositories. He authored a formal Assumptions of Use document, clarifying low-level usage, supported path formats, error handling, and thread safety, using reStructuredText and rst. His work established standardized guidelines for concurrent access and integration, supporting onboarding and audit readiness. In eclipse-score/score, Mihajlo introduced a Filesystem Path Validation Responsibility Policy, shifting validation ownership to users and aligning with security requirements. His contributions focused on requirements analysis, software architecture, and software design, providing depth in documentation and governance for future development and compliance.