David Svacina developed two core features for the scrumdojo/quizmaster repository, focusing on enhancing the quiz-taking experience through thoughtful front end engineering. He implemented a keyboard-friendly numeric input interface, introducing autofocus, input validation, and robust keyboard handling to streamline user interactions and reduce friction. Additionally, David improved the results and evaluation flow, clarifying navigation and evaluation controls to boost user confidence and minimize support needs. His work emphasized accessibility, reliability, and intuitive navigation, leveraging React, TypeScript, and UI/UX design principles. The features were delivered through targeted, iterative commits, demonstrating depth in both technical execution and user-centered problem solving.