Sr. SAP Tax & Vertex Engineer

About the Role As a Senior SAP Tax & Vertex Engineer, you will help shape and support Moderna’s global tax technology landscape across SAP S/4HANA with Vertex capabilities to deliver scalable, compliant tax solutions that support Moderna’s expanding global operations. This role anchors Moderna’s Warsaw hub and requires collaboration with Tax, Finance, Digital and business stakeholders to translate regulatory requirements into robust system solutions while driving automation and digital innovation. What You'll Do

• Serve as the SAP and Vertex Subject Matter Expert (SME) for global tax processes across Moderna’s enterprise landscape.
• Design, configure, support, and optimize SAP tax procedures, condition techniques, tax codes, and tax determination logic within SAP S/4HANA.
• Design, implement, and maintain Vertex O-Series integrations, ensuring accurate tax calculation, jurisdiction determination, and reporting consistency.
• Support global indirect tax requirements including: US Sales & Use Tax; European Union VAT; APAC GST; Regional tax compliance models and statutory requirements.
• Support direct tax and withholding tax processes, including integration with finance processes and reporting structures.
• Ensure seamless tax integration across key business processes including: Order-to-Cash (O2C); Procure-to-Pay (P2P); Source-to-Pay (STP); Record-to-Report (RTR); Billing; Procurement; Intercompany transactions; General Ledger postings.
• Support and enhance SAP Document & Reporting Compliance (DRC) solutions and Continuous Transaction Controls (CTC) capabilities.
• Collaborate with global tax teams to interpret regulatory requirements and translate them into scalable system configurations and technical solutions.
• Support and maintain tax-relevant master data, including customer, vendor, material, and tax classification data structures.
• Drive accurate tax reporting and reconciliation leveraging SAP DRC, Vertex O-Series, and related technologies.