Worked on the powerhome/power-tools repository to address a reliability issue in Rails applications using code reloading. Delivered a backend fix in Ruby that prevents duplicate ActiveSupport::Notifications subscriptions by stopping observers before class unload, leveraging ActiveSupport::Reloader.before_class_unload. This approach ensures that event subscriptions are properly cleaned up prior to code re-evaluation, eliminating the risk of multiple event firings after each reload. The solution improved runtime stability and developer experience in environments with frequent code reloads. Demonstrated expertise in backend development, the observer pattern, and Rails internals, and outlined a follow-up plan for cross-repository edge-case coverage and documentation updates.