During March 2025, Silverweed14 focused on stabilizing the RNTupleWriter API within the root-project/roottest repository. They migrated RNTupleWriter from the ROOT::Experimental namespace to the top-level ROOT namespace, unifying the public API and reducing confusion for downstream users. This refactoring involved updating all example usages to reference ROOT::RNTupleWriter directly and removing the previous using declaration. By consolidating the API surface, Silverweed14 improved consistency and lowered the risk of breaking changes for future maintenance. The work demonstrated a strong grasp of C++ and API design principles, with careful attention to refactoring and long-term maintainability of the codebase.