Onestream System Administrator

About Us

Sophos is a global leader and innovator of advanced security solutions for defeating cyberattacks. The company acquired Secureworks in February 2025, bringing together two pioneers that have redefined the cybersecurity industry with their innovative, native AI-optimized services, technologies and products. Sophos is now the largest pure-play Managed Detection and Response (MDR) provider, supporting more than 28,000 organizations. In addition to MDR and other services, Sophos’ complete portfolio includes industry-leading endpoint, network, email, and cloud security that interoperate and adapt to defend through the Sophos Central platform.

Secureworks provides the innovative, market-leading Taegis XDR/MDR, identity threat detection and response (ITDR), next-gen SIEM capabilities, managed risk, and a comprehensive set of advisory services. Sophos sells all these solutions through reseller partners, Managed Service Providers (MSPs) and Managed Security Service Providers (MSSPs) worldwide, defending more than 600,000 organizations worldwide from phishing, ransomware, data theft, other every day and state-sponsored cybercrimes.

The solutions are powered by historical and real-time threat intelligence from Sophos X-Ops and the newly added Counter Threat Unit (CTU). Sophos is headquartered in Oxford, U.K. More information is available at

This position will report to the Global Accounting Compliance Controller and will be responsible for maintaining and managing the Onestream system. You will be responsible for ensuring the integrity, performance, and reliability of the system, troubleshooting and resolving system issues, while also supporting end users and driving enhancements to meet evolving business needs.

Working closely with Finance and IT teams, the Onestream Administrator will contribute to the continuous improvement of financial control and reporting processes, ensuring data accuracy, compliance, and operational efficiency. This includes leveraging automation and emerging AI capabilities, within Onestream and complementary tools, to enhance data quality, streamline workflows, and improve user experience.

The role will also be responsible for producing documentation, developing and delivering user training and driving strategic roadmap development to ensure alignment with business objectives and system evolution.

The role has no direct reports but will be supported by another team member who will assist with day-to-day and BAU (business-as-usual) system administration tasks.

• System administration:
• Metadata management
• User management (set up, disablement, access controls etc)
• Manage system configuration
• Maintain and support manual and automated interfaces and integrations e.g. with SAP
• Data management, including data loading, validation and reconciliation processes to ensure accuracy across entities and reporting hierarchies
• System monitoring and issue resolution – oversee daily system operations, identify, troubleshoot and resolve system issues promptly to ensure smooth operations
• Identify opportunities to apply automation or AI-driven controls to enhance accuracy, improve data validation, or reduce manual effort where appropriate

• User training and support:
• Act as first point of contact for user queries
• Responsible for managing the JIRA ticketing system
• Provide structured user onboarding, training and ongoing knowledge sessions
• Use AI-enabled tools to enhance training materials, user communications, and documentation where beneficial

• Process improvement and roadmap development:
• Identify and implement opportunities to optimize system usage and streamline existing processes
• Keep up to date with emerging developments and trends in the Onestream Solution Exchange with a view to optimize Sophos processes by leveraging the latest functionality
• Collaborate with stakeholders to define and maintain a Onestream roadmap, ensuring enhancements align with strategic business priorities
• Evaluate and integrate emerging AI capabilities, such as predictive analytics, automated reconciliations, workflow optimization, and intelligent reporting, into the roadmap where relevant

• Other:
• Reporting &…