Worked on the minio/minio-go repository to enhance the reliability of policy expiration handling in distributed environments. Focused on backend and API development using Go, the main contribution was a targeted bug fix that standardized the marshaling of PostPolicy expiration times to UTC. This approach eliminated time zone discrepancies that previously caused inconsistencies across regions, thereby reducing policy-related errors in multi-region deployments. By explicitly handling UTC in the marshaling logic, the work improved code quality and minimized the risk of future regressions related to time zone handling. The contribution addressed a core reliability issue without introducing new features during the period.