SAP Developers in Germany

Using periods between projects to deepen leadership skills and Change Management methods.

• Personnel and culture development: Supporting specialists and managers with professional reorientation and providing strategic coaching for successful self-presentation.

• Empowerment & Performance Coaching: Conducting systemic personality assessments to identify performance bottlenecks and specifically develop strengths within teams.

• Moderation & Training: Managing interdisciplinary workshop and seminar groups in both industrial-technical and commercial environments.

• Project Argo: SAP BW/4 Hana Project Lead, Program and Application Manager, SAP BW/4 Hana Consultant, Architect and Developer.
• Migration of FI data models from SAP BW 7.x to BW/4 Hana.
• Review and implementation of the user and authorization concept.
• SAP S/4 Hana, SAP Basis, SAP BW/4 Hana data modeling and use of the SAP BW Migration Workbench.
• Use of Business Content, BAPI, BW/4 Hana, Hana Studio, HANA Views, Analytical Views, virtual tables and Hana Native SQL.
• Work with ADSO, Open ODS Views, Composite Provider, Hybrid Provider, SAP Solution Manager, Query Designer, Analysis for Office, Lumira and Fiori.
• Use of SAP SAC (Stories, Data Models, Data Analyzer, CDS Views), as well as application management and monitoring of process chains and load jobs.

• Lead architect for an enterprise loan digitisation programme, coordinating 12 engineers across five workstreams and serving as final technical authority on system design.
• Cut critical application response times by 68% (display 17.3s → 5.6s; modification 11.8s → 5.0s) through targeted caching, OData query optimisation and lazy-loading refactoring; further optimisation in progress.
• Own production error triage, prioritisation and resolution across a multi-application portfolio supporting live lending operations.
• Design and implement SAP Fiori applications on SAP UI5, TypeScript and RAP, owning delivery from architecture and code through rollout and production support.
• Established C4 architecture documentation and decision records for the full programme, enabling faster onboarding and consistent cross-workstream design governance.
• Co-managed S/4HANA release cycle alongside primary responsibilities, coordinating directly with SAP support to resolve critical system issues across the portfolio.

AI-Native S/4HANA Custom Development

Solution architecture and implementation of an extensive SAP S/4HANA custom solution replacing required retail/POS standard functionality directly in S/4HANA.

• Architecture and technical design for inbound, persistence, enrichment, validation, aggregation and outbound processing
• Modular SAP ABAP / ABAP OO implementation based on Clean Core, Clean Code and testability principles
• AI-native development workflow with AI-generated implementation and test code
• Orchestration of specialized AI roles for discovery, planning, development and independent reviews
• Decision Freeze, Build Plans and Quality Gates for controlled AI-based delivery
• Human Design Authority for architectural decisions, SAP validation, technical acceptance and release

IMPACT ACHIEVED:

• Productive use of an AI-native engineering model in a real enterprise SAP project
• Extensive modular custom solution with several hundred SAP development objects
• High maintainability and testability through modular architecture, automated tests and structured reviews
• Replacement of required standard functionality to reduce recurring licensing and operating costs

• WRICEF objects (Reports, Interfaces, Conversions, Enhancements, Forms and Workflow) in the FI and CO modules of S/4HANA ECC using ABAP OO
• Use of SAP HANA Studio, AIF, SAP Solution Manager, Confluence and Jira
• Environment: SAP S/4HANA on Premise 2020

• Optimization of software lifecycle processes for SAP platform apps (BTP CAP)
• Development of template MCP servers for S/4 CALM systems of Porsche AI (BTP)
• Design, development, and IT product management for two MS CoPilot custom agents supporting SAP systems (incl. MCP integration)
• Lead Center of Practice: AI-assisted ABAP development
• Initiation and coordination of the proof of concept implementation of conduct.ai
• Advising application teams on software and integration architecture, clean core principles and implementation, as well as AI use on the SAP platform

• Consulting and implementation of SAP projects as a freelancer
• Analysis, design, Customizing and programming
• Modules: PP, MM, WM, SD, QM, CS, IH, FI/CO, PLM, EH&S
• Development of forms (Smartforms, Adobe Forms)
• ABAP development (Enhancements, BADI, Dialogs, Reporting, Idocs)
• Project management, subproject management and training

Migration of data models to SAP BW/4HANA and development

• Coordination of the migration from BW 7.5 to BW/4HANA
• Coordination of optimization measures
• Coordination of the implementation of work packages
• Requirements analysis with stakeholders

Technologies used: SAP BW/4HANA, ABAP ADT, BW Modeling Tools, ABAP, SAP FI/CO, SAP SD

• Supported an integration project between SAP S/4HANA and a MES / Siemens Opcenter system via Azure Middleware.
• Responsible for SAP-side analysis, mapping and provisioning of relevant data objects such as material master data, production orders and process orders using SAP standard APIs and OData services.
• SAP-side mapping for Material Master, Production Orders and Process Orders
• Usage of API_PRODUCT, API_PRODUCTION_ORDER_2_SRV and API_PROCESS_ORDER_2_SRV
• Consideration of SAP S/4HANA Advanced Available-to-Promise for order confirmation, production availability and downstream MES execution
• Support for SAP Gateway and OData service topics
• Interface coordination between SAP S/4HANA, Azure Middleware and MES / Siemens Opcenter
• Support for testing, monitoring and error analysis
• Worked with BTC Cockpit and Deloitte ASADEV Tool

• Interim SAP BW Senior Consultant

• Analysis and optimization of the analysis authorization concept

• Analysis of the existing SAP BW authorization concept, particularly the mechanisms for assigning analysis authorizations to various organizational units.

• Development of an enhanced concept to standardize authorization management.

• Prototypical implementation of a solution for multidimensional authorization linking without additional CompositeProviders.

• Use of dynamic control via Customer Exits in combination with an authorization ADSO, in which permitted combinations can be centrally maintained.

• Application of the Cartesian product concept for precise modeling and authorization of permitted combinations from multiple analysis authorization dimensions, enabling flexible and consistent access control.

• The new structure simplifies the management of complex authorizations, reduces redundancies, and makes extensions easier.

• It was initially implemented as a prototype to create a well-founded basis for decisions regarding further strategic direction.

• After successful validation and positive evaluation by the project team, the solution was further developed productively as part of a User Story and rolled out across the entire SAP BW system.

• Virtual key figures & OLAP calculations

• Capital Lock Up Ratio (CLR%)

• Development and implementation of complex virtual key figures using BAdI RSROA_OLAP_BADI, including:

• Net Service Revenue – 3 Month: Dynamic calculation of three-month totals across all periods of the selected year.

• Capital Lock Up Ratio %: Key figure for measuring capital tied up, calculated as the ratio of NSR to the cumulative NSR three-month total from P1 to the current drilldown period; used to analyze how much capital is tied up in the company before it is converted into revenue – essential for liquidity management.

• Implementation of a mechanism for simultaneously passing two FISCPER intervals:

• One interval for displaying the period.

• One interval for restricting the data.

• Objective: Implementation of a moving average based on a dynamic drilldown period to determine capital tied up accurately for each period.

• Account hierarchy-based key figure management

• Development of dynamic key figure assignment based on account hierarchy nodes as an enhancement of the existing key figure management solution.

• Implementation of BAdI RSROA_OLAP_BADI combined with an easy-to-maintain Customizing table in which the rules for key figure assignment can be defined flexibly.

• Runtime-based mapping of approx. 135 key figures according to the individually maintained rules, without manual system changes.

• Replacement of an earlier AMDP-based SQL logic in which every change to a node or key figure required a code adjustment, clearing the ADSO, and a time-consuming reload (approx. 2 hours).

• The new solution enables ad hoc adjustments via SM30 maintenance – without a new transport, without data reloading, and with significantly reduced system load.

• Significant reduction in maintenance and development effort.

• Avoidance of long loading times and complex AMDP adjustments.

• Increased flexibility in managing key figure assignments, effective immediately without system changes.

• Improved performance and flexibility when analyzing reports.

• Significant reduction in maintenance effort through dynamic control and modularization.

• Contribution to the strategic development of the reporting and authorization system in the SAP BW environment.

• Development of a generic ABAP framework for integrating SAP Analytics Cloud (SAC) Export APIs into SAP BW/4HANA

• Design and implementation of a reusable handler and service class architecture for the automated transfer of data from SAC into BW ADSO structures.

• Automated push reporting with dynamic query integration (SAP BW/4HANA)

• Design and implementation of an ABAP-based push reporting framework for automatic email notifications based on BW query results.

• Development of a central ABAP class for generating the HTML email body, including embedded MIME images (KPI screenshot, logo, etc.) and dynamic recipient management.

• Remote hierarchy & access concept for user-specific WBS structures (Deloitte, 2025/2026)

• Design and implementation of a virtual SAP BW/4HANA hierarchy for user-specific control of WBS elements in complex engagement structures. The objective was to eliminate redundant leaf nodes and ensure that each user sees only their own area of responsibility – both in the F4 value help and within analytical queries.

• For this purpose, I developed a fully dynamic hierarchy generator based on an ADSO that determines the relevant subtrees at runtime and makes them available to the system without physical hierarchy loading. The solution eliminated duplicate structure paths, drastically reduced the data volume per user, and enabled secure, high-performance navigation without visibility of other users’ project data.

• I also analyzed system-side limitations of the SAP standard F4 hierarchy resolution and, based on this, developed an alternative input and proposal concept for users with global views (“ALL”), fulfilling both security and performance requirements.

Technological focus: BW/4HANA, virtual/remote hierarchies, ADSO design, ABAP-based runtime generation, complex F4 logic, access concepts, performance optimization of large hierarchy structures.

• DTO class generator: In-house development of a tool for the automatic generation of classes, functions, and methods for use in .NET Core projects based on SAP Business One Service Layer metadata
• E-invoice import add-on: Development of a SAP Business One add-on / coresuite module for the automated import of ZUGFeRD e-invoices as incoming invoices – with configurable mapping to flexibly control the import logic across four mapping types (DIRECT, SQL, FIXED, EXPR). The add-on is available as a licensed product for SAP Business One customers.

Stack: SAP Business One, SAP Business One Service Layer, coresuite Country Package, C#

• Interim ABAP-OO developer on an S/4 HANA conversion
• Automation of retail pricing (IS-Retail)
• RFC interface between the POS system and S/4 (SD)
• RFC interface between S/4 and R/3 for price comparison (SD)
• Automatic creation and accrual of price conditions (SD)
• Automation of setting the regular supplier in the info record (MM/SD)

• SAP IS-U transformation project

SAP S4Hana transformation project – focus on Customer Engagement (CE) & MCM

• Customizing tasks & Development tasks
• Master data in Customer Engagement (BP/ Contract Account / Contract / PoD &Supply Scenario)
• Customizing Customer Engagement
• Upil
• BSP / Badi / ABAP OO / ADT / CDS / RAP

Functional design and specification of key SAP GTS processes, including

• Compliance,
• EU Preference Management and
• Reporting. Translate business requirements into specifications ready for implementation by third-party development teams.