Aditya Pandey contributed to the kart1ka/cal.com repository by updating the Google Calendar integration documentation, focusing on improving the self-hosting workflow. He identified a gap in the onboarding process and addressed it by adding a step that instructs users to run 'pnpm db-seed' after entering Google credentials, ensuring the integration is properly reflected in the app store. This change, implemented using Markdown and leveraging his documentation skills, clarified the deployment process and reduced potential configuration errors. While the work was limited to a single feature update over one month, it demonstrated attention to detail and improved the reliability of self-hosted deployments.