Tax Systems Production Support Service Engineer

6 Month FTC

Salary: Dependent on experience

Hybrid: 2 days a week in the office

A global consultancy firm is seeking a Service Engineer with expertise in Oracle Fusion Tax, Vertex, and tax-related ERP integrations. This role is responsible for ensuring accurate tax determination and compliance across Payables, Receivables, Intercompany, and Supply Chain transactions. It combines technical troubleshooting with deep knowledge of indirect taxation across global jurisdictions, making it ideal for professionals with experience in tax technology within Oracle Cloud environments.

Tax Configuration & Compliance

• Support and maintain tax configurations in Oracle Fusion Tax and Vertex for global indirect taxes, including Sales & Use Tax, VAT, GST, and Withholding Tax.

• Ensure proper tax determination, exemption handling, and product/service taxability across jurisdictions.

• Manage tax rules, rates, reporting codes, and registrations in Oracle Fusion.

• Support supply chain tax treatment, including intercompany and drop shipment scenarios.

• Provide compliance support for network billing, intercompany tax, and third-party flows.

• Troubleshoot and resolve tax-related production issues via support ticket management and user collaboration.

• Participate in system upgrades and patch testing; recommend performance improvements.

Tax Integration & Calculation

• Configure and troubleshoot Vertex tax calculations across Oracle Cloud Payables (AP), Receivables (AR), and Intercompany.

• Ensure correct tax application on supplier/customer invoices and intercompany settlements.

• Maintain tax logic for procurement flows, including reverse charge VAT and use tax.

• Resolve tax impacts related to intercompany netting and financial orchestration processes.

ERP & System Integration

• Manage and troubleshoot integration between Oracle Cloud ERP and Vertex tax engine.

• Identify and fix tax rule conflicts, API errors, or configuration gaps causing calculation failures.

• Maintain and monitor Vertex API usage, web services, and data feeds between systems.

SQL & Data Analysis

• Use SQL to query tax-relevant data from Oracle Cloud ERP tables (e.g., ZX_LINES, ZX_RATES, AP_INVOICES, AR_TRANSACTIONS).

• Investigate discrepancies in tax postings across AP, AR, and intercompany transactions.

• Conduct tax variance analysis, support audits, and aid reconciliation efforts.

• Optimise system performance for high-volume transaction environments.

Tax Reporting & Period Close

• Generate and validate tax compliance reports (e.g. VAT, GST, Sales & Use, Withholding Tax).

• Reconcile subledger and GL tax balances; assist with accruals and adjustments during period close.

• Ensure accuracy and completeness of tax data during month-end and quarter-end close.

Compliance, Audit & Controls

• Support SOX compliance by maintaining controls and documentation for tax processing.

• Assist in tax audits with detailed transaction records and support files.

• Test and implement Vertex content updates and Oracle quarterly tax updates.

• Manage reconciliations between Vertex, Oracle Fusion Tax, and the General Ledger.

Operational & Cross-Team Support

• Raise and manage Service Requests (SRs) through Oracle MOS and MyVertex portals.

• Track issues, patches, and release notes; perform regression testing for updates.

• Liaise with tax, finance, procurement, and IT teams to resolve cross-functional issues.

• Document SOPs for tax processes, audit prep, rule changes, and troubleshooting protocols.

• In-depth knowledge of indirect tax (Sales & Use, VAT, GST, Withholding Tax).

• 5+ years of experience with Oracle Fusion Tax and Vertex tax engines.

• Experience managing tax compliance across multiple jurisdictions and ERP systems.

• Proficient in SQL for financial and tax-related data analysis.

• Strong understanding of Oracle Cloud integrations and tax reporting.

• Knowledge of SOX controls and audit-ready tax process design.

• Effective problem-solving skills and the ability to work cross-functionally.

Tax