Technical Architect - SAP

Position: SAP S/4HANA Technical Architect Experience: 12+ Years Job Summary We are seeking an experienced SAP S/4HANA Technical Architect to own the technical architecture and provide end-to-end technical design assurance for a large-scale SAP transformation programme in a public-sector / defence environment . Key Responsibilities • Own the end-to-end S/4HANA technical architecture , including system landscape, HANA database, sizing, High Availability (HA) and Disaster Recovery (DR). • Design deployment topology for on-premise, air-gapped or sovereign-cloud environments , including network segmentation and classified-data handling. • Define integration architecture using SAP Integration Suite, PI/PO, APIs, OData, IDoc and BAPI . • Define security architecture covering encryption, key management, IAM/SSO, access controls and system hardening . • Govern SAP transport strategy, DevOps/CI-CD processes and system refresh/copy strategy with Basis teams. • Own non-functional requirements (NFRs) covering performance, scalability and availability. • Lead performance, volume and load-test strategy in coordination with Testing teams. • Define the technical architecture for data migration and develop the technical cutover runbook. • Provide technical design assurance and sign-off against agreed project and contractual acceptance criteria. • Work closely with Functional Architects, Basis, Security, Data Migration, Integration and Testing teams. Required Experience • Minimum 12+ years of SAP technical experience . • At least 5+ years as an SAP Technical / Solution Architect . • Minimum 2 full-lifecycle SAP S/4HANA implementations where the candidate owned: SAP landscape architecture, Integration architecture, Security architecture. • Strong experience with S/4HANA on HANA , landscape design, sizing, HA/DR and infrastructure architecture. • Strong integration experience with SAP Integration Suite / PI-PO, APIs and legacy systems . • Experience with security architecture, IAM/SSO, encryption, network segmentation and system hardening. • Strong understanding of performance engineering, capacity planning and NFR management . • Experience with data migration architecture and cutover planning . • Public-sector / defence experience is highly preferred, particularly restricted, classified or air-gapped environments . Education & Certifications Mandatory • Degree in Engineering, Computer Science or related discipline . • SAP certification in a relevant technical area such as S/4HANA System Administration, HANA or Integration . • SAP Activate awareness. Preferred • TOGAF or equivalent enterprise architecture certification. • SAP BTP / Integration Suite certification. • Security certifications such as CISSP, CCSP or ISO 27001 Lead Auditor . • Relevant cloud/infrastructure certifications. • Existing or previous Singapore security clearance .