SAP : SAP S​/HANA Brownfield Conversion Technical Architect

Our global manufacturing client is looking to hire a senior SAP technical architect to lead the technical design of a Brownfield conversion from SAP ECC to S/4

HANA, working directly with the ERP director. Go-live is November 2027.

Requirements:

• 15+ years of SAP technical experience, with at least 5 years focused on S/4
  
  HANA transformations
• Multiple Brownfield conversions delivered end to end
• Experience on old, heavily customised SAP systems with many legacy interfaces, multiple modules and country localisations
• A track record of producing technical design documents that have passed sign-off with senior and technical stakeholders
• Strong expertise in SUM, DMO and downtime optimisation
• Experience with SAP Readiness Check, Simplification Item Checks, Custom Code Migration Worklist and ATC
• Strong knowledge of S/4
  
  HANA, Basis, HANA database architecture, ABAP, integrations and Fiori architecture
• Azure experience
• Experience with SAP security, transport management and release processes
• Knowledge of the S/4
  
  HANA extensibility framework, clean core principles and custom code modernisation
• Experience working alongside a global SI partner
• Strong stakeholder management across PMO, architecture, functional and executive audiences, including defending technical decisions to a CFO
• Degree in computer science, IT, engineering or a related discipline

Responsibilities
:

• Own technically sound SAP design documents that account for legacy code and custom functionality
• Design for a system documented since 1996: many modules, country variations and localisations, extensive custom code, numerous old interfaces
• Show where technical debt sits and how the conversion removes it, supporting the risk-reduction business case
• Secure sign-off from the PMO, architects, ERP director, CFO, SAP-literate functional specialists and implementation partner
• Give change management the technical base to explain what the conversion means to each stakeholder
• Define end-to-end technical architecture, migration roadmaps and implementation standards
• Lead and guide technical work streams across Basis, infrastructure, integrations, ABAP, Fiori and security
• Review and approve solution designs and deployment plans
• Assess and document ECC integrations with satellite applications: dependencies, interfaces, data flows, risks
• Lead impact assessment across interfaces, middleware, APIs, custom developments and third-party applications
• Coordinate remediation with application owners, integration teams and vendors so business-critical integrations survive go-live
• Lead custom code assessment and remediation (simplification items, ATC, analysis tools)
• Set strategy for ABAP adaptation, decommissioning obsolete code and clean core adoption
• Drive SUM/DMO execution: sizing, performance, downtime reduction and cutover procedures
• Govern migration cycles (sandbox, development, quality, dress rehearsal, production) with checkpoints and quality gates
• Design high-availability, scalable, secure Azure landscapes with cloud, infrastructure and security teams
• Guide system refreshes, retrofit, transport management and environment strategy
• Identify risks and mitigations; support testing, cutover readiness and post go-live stabilisation

Relevant Keywords: S/4

HANA Technical Architect, SAP Technical Architect, SAP Solution Architect, S/4

HANA Migration Architect, S/4

HANA Conversion Lead, SAP Technical Lead, SAP Basis Architect, Brownfield, System Conversion, ECC to S/4

HANA, Legacy Modernisation, Custom Code Migration Worklist, Custom Code Remediation, Custom Code Adaptation, Interfaces, Middleware, APIs, IDoc, RFC, BAPI, PI/PO, CPI, Integration Suite, SAP Basis, Azure, SAP on Azure, Technical Design Documents, Quality Gates, Architecture Governance, Design Authority, Stakeholder Management