During February 2025, Rosica worked on the bazelbuild/bazel repository, focusing on improving the reliability and efficiency of the Bazel build system. She addressed a bug in input artifact mapping by converting input collections from lists to sets, ensuring automatic deduplication of inputs sourced from dependency sets. This data-structure optimization, implemented in Python, reduced duplicate processing and memory overhead during builds, leading to more correct and efficient artifact handling. Rosica’s work demonstrated strong skills in build systems, code refactoring, and data structures, and reflected a thoughtful approach to debugging and incremental delivery within a large-scale open-source environment.