SAP S/4HANA Brownfield Conversion Technical Architect

SAP S/4HANA Brownfield Conversion Technical Architect - English Speaking - Remote Work. Start Date: 2nd November 2026. 14 Month Contract Role. End Client! 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/4HANA, 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/4HANA transformationsMultiple Brownfield conversions delivered end to endExperience on old, heavily customised SAP systems with many legacy interfaces, multiple modules and country localisationsA track record of producing technical design documents that have passed sign-off with senior and technical stakeholdersStrong expertise in SUM, DMO and downtime optimisationExperience with SAP Readiness Check, Simplification Item Checks, Custom Code Migration Worklist and ATCStrong knowledge of S/4HANA, Basis, HANA database architecture, ABAP, integrations and Fiori architectureAzure experienceExperience with SAP security, transport management and release processesKnowledge of the S/4HANA extensibility framework, clean core principles and custom code modernisationExperience working alongside a global SI partnerStrong stakeholder management across PMO, architecture, functional and executive audiences, including defending technical decisions to a CFODegree in computer science, IT, engineering or a related discipline Responsibilities:Own technically sound SAP design documents that account for legacy code and custom functionalityDesign for a system documented since 1996: many modules, country variations and localisations, extensive custom code, numerous old interfacesShow where technical debt sits and how the conversion removes it, supporting the risk-reduction business caseSecure sign-off from the PMO, architects, ERP director, CFO, SAP-literate functional specialists and implementation partnerGive change management the technical base to explain what the conversion means to each stakeholderDefine end-to-end technical architecture, migration roadmaps and implementation standardsLead and guide technical workstreams across Basis, infrastructure, integrations, ABAP, Fiori and securityReview and approve solution designs and deployment plansAssess and document ECC integrations with satellite applications: dependencies, interfaces, data flows, risksLead impact assessment across interfaces, middleware, APIs, custom developments and third-party applicationsCoordinate remediation with application owners, integration teams and vendors so business-critical integrations survive go-liveLead custom code assessment and remediation (simplification items, ATC, analysis tools)Set strategy for ABAP adaptation, decommissioning obsolete code and clean core adoptionDrive SUM/DMO execution: sizing, performance, downtime reduction and cutover proceduresGovern migration cycles (sandbox, development, quality, dress rehearsal, production) with checkpoints and quality gatesDesign high-availability, scalable, secure Azure landscapes with cloud, infrastructure and security teamsGuide system refreshes, retrofit, transport management and environment strategyIdentify risks and mitigations; support testing, cutover readiness and post go-live stabilisation Relevant Keywords: S/4HANA Technical Architect, SAP Technical Architect, SAP Solution Architect, S/4HANA Migration Architect, S/4HANA Conversion Lead, SAP Technical Lead, SAP Basis Architect, Brownfield, System Conversion, ECC to S/4HANA, 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