Mathias Fossum focused on maintenance engineering for the kartverket/kvib repository, addressing dependency management challenges in JavaScript projects. During April 2025, he resolved a compatibility issue by aligning the React dependency to version 18 or higher, ensuring the codebase adhered to evolving project standards. This work did not introduce new user-facing features but improved long-term maintainability and reduced the risk of future incompatibilities. Mathias applied his skills in dependency management and JavaScript to streamline the upgrade path for the repository, demonstrating a methodical approach to technical debt and laying a stable foundation for future feature development within the project.