Worked on the Oskar-Dam/kaotika-battle-web and legends-of-kaotika/kaotika-battle-server repositories, focusing on stabilizing the development environment and enhancing user interface feedback. Delivered a foundational build system upgrade using Node.js and TypeScript, improving dependency management and supporting ongoing development. Enhanced the dice roll UI with refined CSS styling and animation for clearer user feedback. Established a formal ESLint-based quality assurance process on the server, progressively enforcing React hook dependency checks and linting rules to reduce runtime issues. These efforts improved code reliability, streamlined onboarding, and reduced maintenance risk, emphasizing code quality and maintainability across both frontend and backend systems.