Keiko Sato enhanced the kufu/smarthr-design-system repository by focusing on accessibility and documentation quality. She delivered updates to the accessibility guidelines, introducing a focus order testing approach to ensure keyboard navigation matches visual presentation, and clarified Japanese documentation to reduce confusion. Using Markdown and applying WCAG standards, Keiko aligned the accessibility checklist with WCAG 2.1, improving both compliance and developer onboarding. Her work addressed usability and maintainability, enabling developers to implement accessible components more confidently. By prioritizing accurate, up-to-date documentation and practical testing methods, Keiko strengthened the repository’s accessibility posture and supported ongoing improvements in developer experience.