During a Hack Week at Sentry, the team embarked on the challenge of implementing dark mode, which quickly evolved from a minor project into a significant overhaul of their design system. The initiative required a meticulous cleanup of color variables and the creation of a consistent color system, which involved refactoring numerous components and resolving inconsistencies across their codebase. By organizing colors into a structured palette and creating aliases for easier toggling between light and dark modes, the team not only enhanced the visual consistency of their interface but also improved maintainability and accessibility. This process entailed extensive collaboration, debate over naming conventions, and careful consideration of component relationships, ultimately leading to a more robust and coherent design system that mitigates the risks of "radioactive" code, which previously plagued their front-end development.