Finance Systems Manager - Dynamics 356 & OneStream

Finance Systems Manager – Financial Services

A leading financial services organisation is seeking an experienced SaaS Systems Manager to oversee and optimise their finance technology landscape. Reporting to both the IT Director and Group Finance & Strategy Director, you will support core finance systems, drive process improvements, and partner closely with global finance teams.

Role & Responsibilities

• Own and manage OneStream and Microsoft Dynamics D365 in line with Finance and IS standards.
• Maintain legal entity hierarchies, system configurations, access controls, and user permissions.
• Partner with accounting teams to resolve D365 issues and ensure smooth daily operations.
• Extract data and perform ETL tasks; manage integrations and data flows between systems.
• Gather and document business requirements for new functionality, modules, and localisation.
• Lead testing, validation, system changes, and workshops with finance and IT teams.
• Support integration of new business units into the company’s financial systems.
• Build dashboards, reports, workflows, and enhance financial processes in OneStream and D365.
• Maintain group COA, create new entities/dimensions, and align mapping with local finance leads.
• Liaise with finance teams, auditors, and stakeholders to ensure systems meet reporting needs.
• 3+ years’ experience with OneStream, Dynamics 365, Hyperion, or similar finance systems.
• Strong understanding of consolidation, accounting processes, and global financial structures.
• Experience with PowerBI and Python.
• Excellent Excel, analytical, communication, and project management skills.
• Degree in Finance, Accounting, Business, or Information Systems.
• Experience in multinational organisations and IFRS/GAAP frameworks.
• OneStream or CPM certifications.
• Reval TMS

Package

• Hybrid working (City of London)
• Health insurance, pension, and professional development