Finance Systems Implementation Accountant; ACA)

Final date to receive applications: 15 November 2026

Department: Finance

Employment Type: Contract / Temp

Location: HQ - Leatherhead

Reporting To: Financial Controller

We are seeking an experienced ACA-qualified accountant to join the finance team and support the implementation of a new finance system. The successful candidate will have extensive experience of accounting system implementations, with particular expertise in both Microsoft Dynamics 365 Business Central and Microsoft Dynamics NAV.
Joining at the implementation stage of the project, the role will work closely with the Finance Team, implementation partner, IT team and key business stakeholders to ensure successful configuration, testing, data migration, training, and go-live activities. The individual will provide hands on support throughout the project and help embed new processes and controls within the organisation.
This is an approximately 4 to 6 month contract, as a Contractor on a daily rate.

• Act as a key member of the finance system implementation team.
• Work closely with the current finance team, the IT team and implementation partner to support delivery of the project plan.
• Review system configuration to ensure alignment with finance requirements.
• Support finance leadership and provide subject matter expertise throughout the implementation phase.
• Support issue resolution and decision making during implementation.

• Lead and support data cleansing for static data
• Support the migration of financial data from Dynamics Nav.
• Validate chart of accounts, supplier records, customer records, fixed assets, budgets, and historic transaction data.
• Perform reconciliation and validation checks to ensure data completeness and accuracy.
• Identify and resolve data issues before go live.

• Develop and execute comprehensive test plans and test scripts.
• Coordinate finance user testing activities.
• Record, track, and manage testing defects.
• Work with implementation consultants to resolve testing issues.
• Support formal sign-off processes.

• Review finance processes and recommend improvements where appropriate.
• Ensure financial controls are maintained and enhanced within the new system.
• Support the design of efficient month end, reporting, budgeting, and transaction processing workflows.

• Develop finance process documentation and user guides.
• Deliver training and knowledge transfer to finance users.
• Provide support during system go live and post implementation stabilisation activities.
• Assist with embedding best practice processes within the finance function.

• Validate management reports and financial reporting outputs.
• Ensure reporting requirements are fully met within the new system.
• Support finance operations during implementation while maintaining business continuity.

• ACA qualified accountant.
• Strong post-qualification experience within finance functions.

• Significant experience supporting and delivering accounting system implementations.
• Proven hands on experience implementing Microsoft Dynamics 365 Business Central
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• Proven hands on experience implementing Microsoft Dynamics NAV
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• Strong understanding of:
  • General Ledger
  • Accounts Payable
  • Accounts Receivable
  • Fixed Assets
  • Budgeting and Forecasting
  • Financial Reporting
• Experience of data migration, reconciliation, and data validation.
• Extensive User Acceptance Testing (UAT) experience.
• Strong Excel skills.
• Ability to work effectively with finance users, software vendors, and implementation consultants.
• Excellent problem-solving and stakeholder management skills.