In November 2024, NebulaStream refactored error handling in the nebulastream/nebulastream repository, focusing on improving clarity and maintainability. The developer replaced the NES_THROW_RUNTIME_ERROR macro with INVARIANT, enabling more precise error reporting and clearer failure modes in C++. They also introduced a NotImplemented path to distinguish between unimplemented features and runtime errors, which streamlines issue triage and debugging. This targeted change, implemented through a focused commit, enhanced the robustness of error handling without broad codebase disruption. Leveraging C++ development and refactoring skills, the work improved production stability and observability, laying groundwork for more reliable long-term error management.