During November 2025, Aman Singh focused on reliability improvements for cal.com’s scheduling system. He addressed a critical bug in the buildSlotsWithDateRanges function, correcting the logic that handles Out-of-Office days to ensure unavailable dates are properly blocked when generating time slots. To prevent future regressions, Aman added targeted test coverage, enhancing the system’s correctness and user trust. His work involved close collaboration with team members through co-authored commits, which improved code review quality and traceability. Leveraging his expertise in TypeScript, full stack development, and testing, Aman delivered a focused, high-impact fix that strengthened the scheduling functionality in cal.com.