Key responsibilities : Provide L2/L3 AMS support for SD/MM and the connected O2C and P2P processes, resolving incidents and service requests within agreed SLAs; Perform root-cause analysis on functional, master-data, and integration failures; drive permanent fixes through problem management; Deliver small enhancements and change requests: configuration in SSCUI/CBC, key-user extensibility (custom fields, logic, forms), Fiori app and business role/ catalog adjustments; Monitor and troubleshoot interfaces between S/4HANA and Salesforce, Zip , Workday, Brex , Avalara, and Concur — message monitoring, payload analysis, reprocessing, and escalation to integration teams; Support master-data governance for customer, material, and supplier/Business Partner objects; Own functional regression testing for SAP quarterly release upgrades: impact assessment of release notes, test scope definition, execution, and defect follow-up; Prepare and maintain functional documentation, test scripts, known-error records, and key-user guidance; Support period-end and month-end activities from the SD/MM side (billing runs, GR/IR, and inventory reconciliation) in coordination with the Finance stream; Train and advise key users; contribute to continuous service improvement and automation initiatives; Collaborate closely with the customer's business process owners, the FI-CO AMS stream, developers, and third-party vendors. 5+ years of hands-on SAP SD and MM configuration and support experience, including at least one full end-to-end implementation; 2+ years on SAP S/4HANA Cloud, Public Edition — practical knowledge of the 3-system landscape, scope items and best-practice processes, Central Business Configuration / SSCUI, Fiori launchpad, business roles and catalogs , and Public Cloud extensibility constraints; Strong process knowledge across both Order-to-Cash and Procure-to-Pay, including SD–FI and MM–FI integration points; Working knowledge of SAP Subscription Billing and/or service contract billing in a subscription/recurring-revenue business model; Demonstrable experience troubleshooting API- and middleware-based integrations (SAP Integration Suite/CPI or equivalent), including communication arrangements, certificates, payload and error analysis; Experience in an AMS/managed-services environment: ticket handling in ServiceNow, Jira, or similar, SLA discipline, ITIL incident/problem/change processes; Experience with SAP quarterly upgrade cycles and regression testing (SAP Cloud ALM or equivalent); Fluent English, written and spoken; confident dealing directly with business users and process owners; Availability to overlap with US business hours (to be confirmed per shift pattern).