Worked on the adzerk/apso repository to deliver a tail-recursive refactor of the fromFullPaths function, focusing on stack safety and scalability for large input sets. Applied functional programming techniques in Scala, introducing an accumulator-based approach and an internal tail-recursive helper to centralize logic while maintaining the existing API. Enhanced the robustness of JSON manipulation by expanding test coverage to validate correctness, scalability, and last-wins behavior for duplicate paths. This work addressed potential StackOverflow errors, improved reliability for processing extensive path lists, and strengthened maintainability through comprehensive, test-driven validation, demonstrating depth in recursion optimization and disciplined engineering practices.