S/4HANA, ABAP, Fiori and RAP expertise. I support mid-size and enterprise clients on integration projects, custom developments and SAP migrations — with a grounded, rigorous and pragmatic approach.
I'm Erwann LE BRUN, a freelance SAP consultant based in France. An ABAP developer by training, I have progressively expanded my scope towards functional consulting, project leadership and solution architecture on S/4HANA.
After more than a decade in consulting firms across various industries (manufacturing, retail, energy, services), I chose independence to deliver expertise, availability and transparency to my clients — without the layers of intermediaries that often dilute value.
My approach: understand the need before writing code, document for the long run, and transfer knowledge so your internal teams can take over once the engagement ends.
From custom development to project leadership, I deliver clearly scoped engagements or integrate with your teams on long-running initiatives.
Custom development on ABAP Cloud, transactional Fiori apps using the RESTful Application Programming model, S/4HANA extensions aligned with Clean Core best practices.
Brownfield, Greenfield or Bluefield support: impact analysis, custom code remediation, SPDD/SPAU adjustment, Simple Finance and Simple Logistics cutover.
Design of Fiori Elements and Freestyle UI5 applications, Launchpad design, app governance setup and CI/CD industrialisation of deliveries.
SAP CPI interfaces, OData V4 APIs, Event Mesh connectors, third-party integrations (Salesforce, EDI, B2B portals). Event-driven, secured architecture.
ABAP code audits, performance analysis, architecture review, Clean Core maturity assessment. Actionable deliverables with clear prioritisation.
Upskilling your ABAP teams on recent technologies: ABAP Cloud, RAP, CDS, Test-Driven Development, Git-based development. Tailored sessions.
An anonymised overview of projects delivered in recent years. Detailed references and testimonials available on request.
Led the custom code workstream on a landscape of 4,000 ABAP objects: ATC remediation, enhancement points adjustment, and key-user support throughout the cutover.
Design and build of a purchase order management portal in Fiori Elements, connected to S/4HANA via OData V4 and to a third-party system via CPI.
Redesign of a critical EDI billing flow (50k transactions/day), migrated to an event-driven architecture on SAP Event Mesh with retry handling and monitoring.
Audit of 12,000 ABAP objects, identification of priority technical debt, and construction of an 18-month Clean Core roadmap with estimates per work package.
Development of a Fiori mobile app for warehouse stock movements: barcode scanner, offline-first mode with synchronisation, integrated with MM processes.
Design of analytical CDS Views powering real-time financial reporting in SAP Analytics Cloud, with consolidated multi-entity KPIs.
Feedback, tutorials and reflections on the modern SAP ecosystem. Published when I have something genuinely useful to share — not to chase content.
Retrospective on a portal redesign using managed RAP. Early design mistakes, what works in production, and what to anticipate from the start.
Read the article →A pragmatic approach to managing ABAP technical debt during a Brownfield S/4HANA migration, with prioritisation based on business criticality.
Read the article →A concrete decision framework to pick between Fiori Elements and freestyle UI5 based on business needs, UX complexity and maintenance constraints.
Read the article →A need to scope, a reinforcement on an ongoing project, or just a conversation about your SAP context — I'll get back to you within 24 business hours.
A message, a call, a coffee — I'm easy to reach.