Worked on the minio/minio-go repository to enhance the reliability of object version listings by addressing a bug in the StartAfter parameter handling. Focused on API development using Go, the work involved updating the key marker logic so that listings would correctly begin at the specified object, as intended by the StartAfter option. To ensure the fix was robust, comprehensive regression tests were added, validating the correct processing of the StartAfter parameter. This approach improved the accuracy of object version listings and strengthened test coverage, contributing to greater API reliability and developer confidence in the MinIO Go library’s version listing functionality.