OneStream Systems Accountant

Senior Systems Accountant – OneStream

London – hyrbid

SystemsAccountants is partnering with a high-growth international business seeking a Senior Systems Accountant to take ownership of its core finance systems environment, with a particular focus on OneStream .

This role sits within Group Finance and offers the opportunity to become the key finance systems contact for consolidation, planning and reporting processes. Working closely with Group Finance, FP&A and senior stakeholders across the business, you will help ensure finance systems continue to support the organisation's reporting, forecasting and transformation objectives.

This is an excellent opportunity for a qualified accountant with strong finance systems experience who enjoys combining financial knowledge with systems expertise.

Key Responsibilities

• Act as the primary finance systems contact for OneStream and related finance applications.
• Support the ongoing administration, enhancement and optimisation of OneStream.
• Partner with Finance teams to improve consolidation, planning, forecasting and management reporting processes.
• Manage system governance, controls, testing and change management activities.
• Support the production of management, board and investor reporting.
• Maintain financial data integrity, master data structures and reporting hierarchies.
• Work closely with technical teams to support integrations between finance systems and wider business applications.
• Identify and deliver opportunities for process improvement, automation and greater reporting efficiency.
• Provide support, guidance and training to finance users across the organisation.
• Contribute to wider finance transformation and systems improvement initiatives.

About You

• Qualified Accountant (ACA, ACCA, CIMA or equivalent).
• Strong experience working with OneStream , including administration, configuration or ongoing system support.
• Good understanding of financial consolidation, management reporting, budgeting and planning processes.
• Experience operating within a multi-entity or international group environment.
• Ability to engage confidently with senior finance stakeholders whilst remaining hands-on with system administration and delivery.
• Understanding of finance data structures, reporting hierarchies and systems integrations.
• Experience supporting finance systems projects, enhancements or transformation initiatives would be advantageous.

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