Atharv Gaur contributed to the layer5io/sistent repository by enhancing the UI theming of the add cluster flow, specifically updating the IMPORT button color from green to Keppel to align with the established design system. Using TypeScript and front end development skills, Atharv ensured the change was minimally invasive and clearly documented in a single commit, making it easy to trace and review. This adjustment improved visual consistency and reduced potential user confusion during cluster creation, reinforcing brand standards. The work demonstrated attention to UI/UX principles and effective use of color tokens, though the scope was limited to a single feature.