Tax Systems Architect: OneSource + SAP Ariba/S4HANA Lead

Warner Bros. Discovery, Inc.; Atlanta (GA); On-site; USD 140,000 - 210,000; Full time

Job summary

Warner Bros. Discovery seeks an experienced Staff Architect for Tax Systems to own end-to-end architecture, implementation, and support of the OneSource tax engine and its SAP Ariba and SAP S/4HANA integrations across US and international entities.

This business-facing, hands-on architect role serves as the primary point of contact between Tax, Ariba, SAP, and OneSource teams to design solutions and triage issues through to resolution. A strong working knowledge of S/4HANA and Ariba is required.

Qualifications

• 9+ years of experience implementing and supporting enterprise tax systems.
• 7-9 years of hands-on implementation or operational experience with Tax solutions like OneSource, Pagero.
• 5-7 years of transactional processing and operations assurance experience.
• Demonstrated expertise with OneSource, including hands-on experience implementing OneSource integration to Ariba and SAP S/4HANA.
• 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/4HANA and SAP Ariba sufficient to understand issues end-to-end and validate fixes across the full transaction flow.
• Proven ability to work across Ariba, SAP, and other parties to triage issues and see them through to completion.
• Excellent communication skills and a collaborative, business-facing approach given the number of parties involved.
• Bachelor's degree in a related field or equivalent experience.
• Not Required but preferred experience: Knowledge of e-invoicing solutions such as Pagero, Edicom, or SOVOS.
• Experience with additional tax engines such as Vertex
• Working knowledge of additional SAP modules (MM, SD, AP) that impact taxation
• Exposure to SAP ABAP or other technical/integration skills
• Experience working in a national or global company
• Experience in the media, entertainment, or streaming services industry

Responsibilities

• Own the architecture and design of OneSource tax engine integrations with SAP Ariba and SAP S/4HANA.
• Lead implementation of new OneSource 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 OneSource configuration, calculation logic, and integration touchpoints with Ariba and S/4HANA.
• Partner with SAP Basis/technical and Ariba teams to ensure solution designs support accurate tax determination, calculation, and posting end-to-end.
• Act as the primary business-facing point of contact for triaging tax integration issues spanning Ariba, S/4HANA, and OneSource.
• Drive cross-team issue resolution, working directly with Ariba, SAP, OneSource, 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.
• Design and execute end-to-end test scenarios spanning Ariba, S/4HANA, and OneSource 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 OneSource.
• Communicate clearly and proactively with Tax, Finance, IT, and vendor stakeholders across the US, Europe, and APAC regions.
• Stay current on the OneSource 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 OneSource/Ariba/S/4HANA integration.

Skills

OneSource

SAP Ariba

S/4HANA

Tax knowledge

Integration architecture

Cross-functional collaboration

Stakeholder management

Education

Bachelor's degree or equivalent

Tools

ABAP

Pagero

Edicom

Job description

Warner Bros. Discovery seeks an experienced Staff Architect for Tax Systems to own end-to-end architecture, implementation, and support of the OneSource tax engine and its SAP Ariba and SAP S/4HANA integrations across US and international entities.

This business-facing, hands-on architect role serves as the primary point of contact between Tax, Ariba, SAP, and OneSource teams to design solutions and triage issues through to resolution. A strong working knowledge of S/4HANA and Ariba is required.