During September 2025, Ssa focused on optimizing access control enforcement in the apache/ozone repository by moving ACL validation for volume and bucket creation to an earlier stage in the request pipeline. By implementing pre-execute ACL checks in Java within OMVolumeCreateRequest and OMBucketCreateRequest, Ssa enabled faster detection of permission issues, reducing unnecessary processing and improving error visibility. The work included developing an integration test to ensure robust ACL enforcement in high-availability distributed systems. This targeted refactoring and testing effort enhanced the efficiency and security of create operations, demonstrating a strong grasp of backend development and access control mechanisms.