During July 2025, Felix Werth focused on backend reliability for the minio/minio-go repository, addressing a critical issue in policy expiration handling. He implemented a bug fix that ensures PostPolicy expiration times are marshaled in UTC, eliminating time zone discrepancies that previously caused inconsistencies across distributed deployments. By standardizing expiration logic, Felix improved cross-region reliability and reduced the risk of policy-related errors. His work involved Go and API development, with careful attention to code quality by making UTC handling explicit in the marshaling process. This targeted fix demonstrates depth in backend engineering and a strong understanding of distributed system requirements.