Senior Finance Systems Accountant Interim

Senior Finance Systems Accountant – OneStream SME

Salary: £65,000 – £70,000 + Bonus & Benefits
Location: Central London / Hybrid & Remote Options

We are working with a PE-backed business looking to appoint a Senior Finance Systems Accountant to support the development, optimisation and governance of its Finance Systems environment.

This is a hands-on role suited to a qualified accountant with strong Finance Systems experience, particularly across OneStream.

Key Responsibilities

• Act as an OneStream SME, supporting system development, optimisation and governance.
• Own or contribute to OneStream implementation projects from a Finance perspective.
• Support consolidation, reporting, planning and wider Finance processes.
• Work across OneStream, NetSuite, Databricks, Navan and Power BI.
• Support data mapping, reconciliation, master data and reporting structures.
• Identify opportunities to automate and improve Finance processes.
• Work closely with Finance, Systems and wider business stakeholders.

About You

• Qualified Accountant – ACA, ACCA, CIMA or equivalent.
• 5+ years’ experience across Finance Systems / Finance Transformation.
• Strong OneStream experience, ideally having owned part of an implementation.
• Good understanding of financial reporting, debits & credits and BAU Finance processes.
• Strong communication and stakeholder management skills.
• NetSuite experience is advantageous.
• Exposure to Data Warehousing / MDM would be beneficial.

This is an excellent opportunity for a qualified accountant looking to combine Finance, Systems, Data and Transformation within a growing PE-backed business.