08/10/2026 updated

JK
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SAP Clean Core, RAP & Fiori Architect | S/4HANA, ADS | Enterprise AI & Python

Osaka, Japan
Worldwide
SAP Certified Development Associate - ABAP with SAP NetWeaver 7.31
Osaka, Japan
Worldwide
SAP Certified Development Associate - ABAP with SAP NetWeaver 7.31

Profile attachments

CV_Comprehensive_English.docx

About me

SAP Clean Core, RAP and Fiori architect for S/4HANA transformations. I design upgrade-safe extensions, UI5 apps, OData/CDS/RAP services and ADS/Adobe Forms, backed by deep ABAP/process architecture plus hands-on enterprise AI, Python and API integration.

SAP S/4HANAArtificial IntelligenceSAP ABAPSAP COSAP HANASolution ArchitectureSAP BTPSAP FioriAdobeSAP UI5
Clean Core, RAP and S/4HANA Extensibility
Current focus: upgrade-safe SAP S/4HANA extension design with Clean Core guardrails, RAP, CDS, OData, released APIs, Custom Fields, Custom Logic, BAdIs, ABAP OO and SAP BTP integration patterns.

Fiori, UI5 and User-Centric SAP Apps
Architecture and implementation support for SAP Fiori and SAPUI5 applications, workflow UIs, launchpad integration, OData/Gateway services, frontend modernization and pragmatic developer coaching for maintainable enterprise UX.

ADS, Adobe Forms and Compliance Documents
Hands-on experience with ADS / Adobe Document Services, Adobe Forms, output forms, ZUGFeRD, XRechnung, e-invoicing, SEPA/CAMT-adjacent document/payment flows and SAP compliance scenarios where layout, data mapping and integration quality matter.

ABAP, Integration and Delivery Architecture
Deep ABAP background across exits, BAdIs, enhancement spots, CDS views, OData services, SAP Gateway, debugging, authorization/runtime analysis, API design and clean implementation packages that developers can actually build.

S/4HANA Process Depth
Strong process grounding across CO, SD, FI, CO-PA, EWM, logistics, billing integration, account determination, costing, settlement rules and value-flow analysis, used to keep technical extensions aligned with business reality.

Enterprise AI, Python and Controlled Automation
Hands-on engineering of enterprise AI assistants, document and knowledge workflows, Python services, OpenAI API integrations, evaluation, model lifecycle and controlled agentic workflows. Customer delivery, presales and internal SDK evaluation remain clearly separated in the project record.

How I Work
I turn vague requirements into architecture, data sources, target logic, scope boundaries, fallback behaviour, test cases and Jira-ready implementation slices.

Current Verified AI Engineering Signals
Verified current signals: AI / SAP presales and solution architecture (since 2026-02); Enterprise AI assistants and OpenAI API engineering (since late 2023); AI-assisted repository engineering workflows (since 2025). Productive customer delivery, customer-specific presales and internal technical evaluation remain explicitly separated in the project record.

Experience

Professional experience10+ years
Freelancer since2019

Languages

GermanNative speakerEnglishNative speakerJapaneseBasic knowledge

Project history

Solution Architect / CEO

Ryu Digital GmbH
Role: Solution Architect / CEO
Environment: SAP BTP, SAPUI5/Fiori, S/4HANA Cloud, SAP Joule, AI integrations, DevOps

- Designed SAP and AI solution architectures for client-specific business processes.
- Built SAP Joule/BTP extension concepts and integrations into backend systems and third-party services.
- Delivered SAP Fiori/UI5, OData/REST and ABAP-based implementation support across client projects.
- Led SAP training and enablement for UI technologies, S/4HANA Cloud and implementation readiness.
- Managed DevOps-oriented delivery with Docker, Kubernetes, CI/CD and cloud infrastructure.

SAP S/4HANA CO/SD Development & Solution Consultant

Jungheinrich AG
Role: SAP S/4HANA CO/SD Development & Solution Consultant
Environment: SAP S/4HANA, CO, SD, FI, ML, CO-PA, Revenue Recognition, ABAP, Clean Core

- Analysed S/4HANA CO/SD/FI value flows across sales orders, billing, service contracts, CO-PA and revenue recognition.
- Designed Clean-Core-near LTR account determination using Custom Fields, Custom Logic, VBRP/VBFA/CRMS4 derivation, C803 and ZOFI.
- Defined SD/CO posting logic for rental contracts, modular battery settlement rules and internal reposting scenarios.
- Reworked costing logic from SD price reads to sales-order cost estimates and COGM cost-component split.
- Prepared implementation-ready specs with data sources, interfaces, fallback logic, test cases and Jira-ready work items.

SAP HCM Travel Frontend Developer (UI)

Bundesagentur für Arbeit
Role: Public Sector SAP Project Access & Onboarding Consultant
Environment: SAP project access, secure workstation, Remote Desktop, public-sector compliance

- Prepared customer-compliant SAP project access for Bundesagentur für Arbeit.
- Analysed German work-location requirements, Remote Desktop setup and secure workstation prerequisites.
- Clarified tool, installation and access constraints for project readiness.
- Kept onboarding decisions aligned with public-sector access gates and secure customer access separation.

SAP Developer & Solutions Architect

Itesys
Role: SAP Developer & Solutions Architect
Environment: SAP S/4HANA, RAP, ADS/Adobe Forms, Smartforms, DDL, SAP Gateway, OData

- Implemented an in-SAP ZUGFeRD/XRechnung e-invoicing solution without external services.
- Built DDL/XML structures and RAP-related logic for invoice output requirements.
- Developed and adjusted Adobe Forms, Smartforms and Swiss QR bill forms.
- Debugged Fiori applications plus SAP Gateway/OData integration issues.
- Advised on clean SAP extension boundaries for regulated invoice-output scenarios.

SAP Developer

Cicor GmbH
Role: SAP Developer
Environment: SAP S/4HANA, FI/CO, ADS/Adobe Forms

- Developed Adobe Forms for FI/CO document and output processes.
- Standardised form handling and output structure for new S/4HANA processes.
- Aligned form logic with SAP data sources and business document requirements.

SAP Fiori Developer

Itesys
Role: SAP Fiori Developer
Environment: SAP S/4HANA, SAPUI5/Fiori, SAP Flexible Workflow, Keydoc, VS Code

- Developed a new Keydoc Inbox with SAPUI5/Fiori freestyle UI.
- Replaced deprecated SAP Inbox controls with supported UI5 components.
- Configured and enhanced SAP Flexible Workflow integration for document approvals.
- Extended workflow scenarios and app integration for business-ready inbox processes.

SAP Security & Authorization Consultant

Roche AG
Role: SAP Security & Authorization Consultant
Project: Aspire
Environment: SAP S/4HANA, SAP GTS, PFCG, SAP Authorizations, Compliance

- Worked as SAP GTS authorization specialist in the Aspire S/4HANA project.
- Analysed PFCG role changes and authorization impact for business users.
- Planned and coordinated security changes with compliance and access-governance stakeholders.
- Documented workshop decisions and implementation scope for controlled role changes.

SAP QM/PP/PE Business Consultant

Mayr-Melnhof Karton AG
Role: SAP QM/PP/PE Business Consultant
Environment: SAP S/4HANA, TIPS migration, QM, PP, PE

- Created 20 Process Design Documents for QM, PP and PE migration from TIPS to S/4HANA.
- Documented source/target process design, validation points and test-relevant scenarios.
- Clarified logistics, production and finance dependencies with customer stakeholders.
- Supported Scrum ceremonies, workshops and on-site process clarification.

Senior Solution Architect / Team Lead Authorization and User Management

GfK
Role: Senior Solution Architect / Team Lead Authorization and User Management
Environment: SAP ERP/HANA, FI, CO, PS, BI on HANA, SAP Authorizations, PFCG, GRC, SOX
Team Size: 40+ consultants in carve-out project

- Led Finance Consulting workstreams across FI/CO/PS in carve-out and merger context.
- Governed finance-related SAP changes with impact analysis, testing and release readiness.
- Led SAP authorization and user-management streams for business-critical landscapes.
- Performed SOX/access reviews, SoD checks and PFCG-based remediation of authorization gaps.
- Acted as key technical contact for permissions and system landscape during NIQ merger execution.

SAP Fiori Training Manager

ITSCare
Role: SAP Fiori Training Manager
Environment: SAP Fiori Elements, SAPUI5, CDS annotations, SAP HANA, XSA

- Coached developers in SAP Fiori Elements, SAPUI5, CDS annotations and SAP HANA/XSA.
- Led trainees through a practical Fiori Elements development project.
- Completed List Report/Object Page implementation when the trainee delivery needed recovery.
- Developed HANA database fragments and Fiori application parts.
- Introduced test automation and practical delivery coaching.

Mdg Consultant

Migros
Customizing in several SAP systems including MM, SD, PM, EWM, and MDG modules for retail and e-commerce operations.

Ps Consultant

Geberit
SAP PS module customization for manufacturing industry project management requirements.

Solution Architect Logistics And Ewm

RUAG Aerospace AG
Implemented SAP IBP for supply chain optimization and integration with existing S/4HANA modules in logistics and transport industry.

Sap S/4Hana Pre-Sales Architect

wescaleIT
Leading pre-sales workshops for S/4HANA and SAP Fiori implementations, focusing on finance and HR team workflows on cloud platforms.

Training Manager, Consultant Ewm On S/4Hana

Komax
Managing workshops for business user requirements understanding and EWM solution customization with Japanese staff in retail and e-commerce.

Sap Fiori Architect

SUVA
SAP CRM customization and development of standard CRM modules for insurance industry applications.

Sap Master Data Management Consultant, Team Lead

PAX AG
Address comparison with Swiss Post database, sanction list software handling, and technical team leadership for go-live transports in insurance sector.

Consultant

Bank Vontobel
Documentation of new customizing options for banking and finance industry SAP implementations.

Solution Architect

Swiss Life AG
User-Exit/BAdI definitions implementation for automated process achievement in insurance industry systems.

Team Lead Logistics And Development Consulting (Cognizant)

Debrunner Koenig Holding AG
Transport management implementation using ABEX-Trace tool for logistics and transport industry optimization.

Solution Architect, Project Leader

Migros
Management and preparation of employee trainings for Fiori development (UX100 and UX101 courses) in retail and e-commerce environment.

Solution Architect

cablex AG (Swisscom)
Live demos coordination and customer contact management for telecommunications industry SAP implementations.

Project Team Lead, Solution Architect

GISA GmbH
Code checking and transport management for S/4HANA System migration in telecommunications industry GISAmove Project.

Project Team Lead, Solution Architect

Swisscom AG
Code checking and transport management for S/4HANA System migration in telecommunications S/4HANA Migration project.

Mm/Ewm Consultant, Solution Architect, Developer (Front-End, Back-End And Iot)

Swisscom AG
Customizing setup for MM, EWM, LE-TRA, PM modules and implementation of new concepts for Industry 4.0 Project realization in market research.

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