Manage controlled changes across development, UAT, and production environments, including testing, migration, release documentation, post-deployment validation, backout planning, and audit-ready evidence; ensure material changes receive independent business/UAT validation and required approvals in accordance with change-management controls. Partner with the OneStream Product & Reporting Lead on demand intake, business requirements, backlog prioritization, release planning, UAT, user support, and stakeholder communication; serve as the designated backup for selected Product & Reporting Lead responsibilities during absences, peak reporting periods, and critical business cycles.