Staff, Architect - Tax Systems (OneSource

Staff, Architect
- Tax Systems

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Your New Role...

The Staff, Architect
- Tax Systems will own the end-to-end architecture, implementation, and support of the One Source tax engine and its integrations with SAP Ariba and SAP S/4

HANA across US and international entities. This is a business-facing, hands-on architect role that serves as the primary point of contact between Tax, Ariba, SAP, and One Source teams to design solutions and triage issues through to resolution. The role requires a strong working knowledge of the broader S/4

HANA and Ariba landscape to understand issues end-to-end and validate fixes across the full transaction flow.

Your Role Accountabilities...

One Source Architecture & Integration

• Own the architecture and design of One Source tax engine integrations with SAP Ariba and SAP S/4
  
  HANA
• Lead implementation of new One Source integrations, tax content, and determination logic for new entities, regions, and business requirements across the US and international landscape
• Serve as the subject matter expert on One Source configuration, calculation logic, and integration touchpoints with Ariba and S/4
  
  HANA
• Partner with SAP Basis/technical and Ariba teams to ensure solution designs support accurate tax determination, calculation, and posting end-to-end Issue Triage & Resolution
• Act as the primary business-facing point of contact for triaging tax integration issues spanning Ariba, S/4
  
  HANA, and One Source
• Drive cross-team issue resolution, working directly with Ariba, SAP, One Source, and other vendor/support teams to see issues through to completion
• Perform root-cause analysis on tax determination and posting discrepancies and recommend corrective configuration or process changes

Testing & Quality Assurance

• Design and execute end-to-end test scenarios spanning Ariba, S/4
  
  HANA, and One Source for new implementations, upgrades, and defect fixes
• Validate that tax determination and postings are correct across the full procure-to-pay transaction flow, not just within One Source

Cross-Functional Communication & Stakeholder Management

• Communicate clearly and proactively with Tax, Finance, IT, and vendor stakeholders across the US, Europe, and APAC regions
• Manage expectations across multiple parties and maintain a collaborative, solutions-oriented approach to issue resolution

Governance & Continuous Improvement

• Stay current on the One Source product roadmap, regulatory/tax changes, and SAP/Ariba release updates that affect tax integrations
• Identify opportunities to improve integration reliability, reduce manual intervention, and strengthen the overall tax systems landscape
• Maintain architecture, configuration, and process documentation for the One Source/Ariba/S/4
  
  HANA integration

Qualifications & Experiences...

• 9+ years of experience implementing and supporting enterprise tax systems
• 7-9 years of hands-on implementation or operational experience with Tax solutions like One Source, Pagero.
• 5-7 years of transactional processing and operations assurance experience
• Demonstrated expertise with One Source, including hands-on experience implementing One Source integration to Ariba
• US and international tax systems implementation experience
• Functional tax knowledge - understanding of tax posting logic and requirements for US, Europe, and APAC regions
• Ability to interpret tax regulatory requirements by region and assess their impact on tax engine configuration, master data, and downstream postings
• Solid working understanding of SAP S/4
  
  HANA and SAP…