Rajdeep Das worked on improving theme switching reliability for embed elements in the kart1ka/cal.com repository. He addressed a bug where theme changes were not consistently applied based on system or user preferences, focusing on frontend development using JavaScript, TypeScript, and CSS. Rajdeep standardized the theme class names for embed elements, replacing hardcoded strings with constants to enhance maintainability and prevent future regressions. His changes ensured that theme updates propagate correctly across different scenarios, resulting in a more consistent user experience. The work demonstrated attention to detail in code quality, though it was limited in scope to a single targeted bug fix.