User Acceptance Testing Accountant

3 Month Contract | £300 per day - Outside IR35 | West Sussex | Onsite

An established business is seeking an experienced UAT Accountant to support a key financial systems migration over a three month assignment, running from early November 2026 through to the end of January 2027.

Working closely with the Financial Controller and implementation team, you will play a hands on role in testing, validating and reconciling accounting data and processes ahead of the new system going live.

Key responsibilities include:

• Executing UAT scripts across core accounting and finance processes.
• Testing and validating customer invoices, credit notes, supplier bills, payments and journal entries.
• Reconciling imported data, opening balances, AR/AP control accounts and bank balances against legacy records.
• Checking VAT treatments, foreign currency transactions, fixed assets and month end accounting processes.
• Identifying and documenting discrepancies, logging system defects and supporting their resolution.

About you:

• Strong practical accounting experience across AR, AP, general ledger and balance sheet reconciliations.
• Experience supporting UAT, financial systems implementation or ERP migration projects.
• Confident using Excel for data analysis, matching and reconciliation.
• Experience with Odoo or similar ERP/accounting platforms would be advantageous.
• Highly organised, methodical and detail focused, with strong numerical accuracy.

Assignment details:

• Contract: 3 months, early November 2026 to end of January 2027
• Rate: Around £300 per day
• Location: West Sussex
• Working pattern: 3 to 5 days per week, onsite

This is an excellent opportunity for an accounting professional with systems testing or implementation experience to support a significant finance transformation project.