OneStream Finance Systems Manager

Systems Accountants; Greater London; On-site; GBP 80,000 - 110,000; Full time

Job summary

SystemsAccountants, partnering with a leading international organisation in London, is recruiting a OneStream Finance Systems Manager. This role offers hybrid working in London and a pivotal place in the finance transformation journey, focused on OneStream administration, governance, and continuous improvement across reporting, planning, and analytics.

You will work with Group Finance, FP&A, Accounting, IT, and regional finance teams to own the OneStream platform, drive process enhancements, and

Qualifications

• Strong hands-on experience with OneStream administration, support, or development.
• Experience supporting financial consolidation, planning, budgeting, and management reporting processes.
• A strong understanding of finance systems, data flows, integrations, and reporting structures.
• Experience working closely with Finance, FP&A, Accounting, and IT stakeholders.
• Excellent problem-solving and stakeholder management skills.
• Previous experience in a Finance Systems, EPM, Consolidation Systems, or Financial Reporting Systems role.

Responsibilities

• Manage and maintain the OneStream application, including hierarchies, dimensions, metadata, workflows, and reporting structures.
• Administer user security, access controls, approval workflows, and governance processes.
• Oversee reporting cycle activities, including period opens, closes, and workflow management.
• Ensure all system changes are appropriately documented, tested, and controlled.
• Support monthly, budget, forecast, and long-range planning processes.
• Assist with Group consolidation activities, including intercompany eliminations, FX translation, and consolidation rules.
• Investigate reporting variances and ensure data integrity across finance processes.
• Support the production of management reports, reporting packs, budgets, and forecasts.
• Support integrations between OneStream and source systems, including ERP platforms and other finance applications.
• Investigate and resolve data load, mapping, validation, and reconciliation issues.
• Work with Finance and IT stakeholders to improve processes and automate recurring activities.
• Drive enhancements that improve reporting efficiency and reduce manual intervention.
• Act as a key point of contact for finance users across multiple regions.
• Troubleshoot system issues and coordinate resolutions with internal teams and external partners.
• Deliver training, user guidance, and knowledge-sharing sessions.
• Build strong relationships with Finance, IT, and external stakeholders.
• Provide oversight and guidance to Finance Systems Analysts or supporting resources.
• Help prioritise support requests, reporting requirements, and enhancement initiatives.
• Support broader finance transformation programmes involving EPM, ERP, reporting, and analytics solutions.
• Contribute to the long-term finance systems roadmap and capability development.

Skills

OneStream administration

Stakeholder management

Finance systems

Tools

OneStream

Job description

OneStream Finance Systems Manager

London – days in the office

SystemsAccountants is partnering with a leading international organisation in London to recruit a OneStream Finance Systems Manager. This is a fantastic opportunity to join a business at a pivotal stage in its finance transformation journey, playing a key role in the ongoing development of its Group reporting, consolidation, and planning capabilities.

Working closely with Group Finance, FP&A, Accounting, IT, and international finance teams, you'll take ownership of the OneStream platform, ensuring its effective administration, continuous improvement, and alignment with wider business objectives.

This position offers the chance to make a significant impact as the organisation continues to invest in its financial reporting, planning, and analytics landscape.

Key Responsibilities

OneStream Administration & Governance

• Manage and maintain the OneStream application, including hierarchies, dimensions, metadata, workflows, and reporting structures.
• Administer user security, access controls, approval workflows, and governance processes.
• Oversee reporting cycle activities, including period opens, closes, and workflow management.
• Ensure all system changes are appropriately documented, tested, and controlled.

Financial Reporting & Consolidation Support

• Support monthly, budget, forecast, and long-range planning processes.
• Assist with Group consolidation activities, including intercompany eliminations, FX translation, and consolidation rules.
• Investigate reporting variances and ensure data integrity across finance processes.
• Support the production of management reports, reporting packs, budgets, and forecasts.

Data Integration & Systems Improvement

• Support integrations between OneStream and source systems, including ERP platforms and other finance applications.
• Investigate and resolve data load, mapping, validation, and reconciliation issues.
• Work with Finance and IT stakeholders to improve processes and automate recurring activities.
• Drive enhancements that improve reporting efficiency and reduce manual intervention.

User Support & Stakeholder Engagement

• Act as a key point of contact for finance users across multiple regions.
• Troubleshoot system issues and coordinate resolutions with internal teams and external partners.
• Deliver training, user guidance, and knowledge-sharing sessions.
• Build strong relationships with Finance, IT, and external stakeholders.

Team Leadership & Finance Transformation

• Provide oversight and guidance to Finance Systems Analysts or supporting resources.
• Help prioritise support requests, reporting requirements, and enhancement initiatives.
• Support broader finance transformation programmes involving EPM, ERP, reporting, and analytics solutions.
• Contribute to the long-term finance systems roadmap and capability development.

Required Experience

To be considered for this role, you will have:

• Strong hands-on experience with OneStream administration, support, or development.
• Experience supporting financial consolidation, planning, budgeting, and management reporting processes.
• A strong understanding of finance systems, data flows, integrations, and reporting structures.
• Experience working closely with Finance, FP&A, Accounting, and IT stakeholders.
• Excellent problem-solving and stakeholder management skills.
• Previous experience in a Finance Systems, EPM, Consolidation Systems, or Financial Reporting Systems role.

Desirable

• Experience large ERP environments.
• Exposure to Power BI or wider reporting and analytics platforms.
• Experience supporting finance transformation or system implementation projects.
• Previous team leadership or supervisory experience.

The opportunity:

• Opportunity to take ownership of a strategically important OneStream platform.
• Exposure to senior finance stakeholders across a global organisation.
• Involvement in a major finance transformation and systems enhancement programme.
• Hybrid working arrangement based in London.
• Competitive salary and benefits package.