ABAP Development for SAP On-Premise – from R/3 to S/4HANA.
We develop, enhance, and optimize custom code in legacy SAP landscapes. Pragmatic, deployment-safe, and seamlessly integrated into your existing systems.
Development That Works in Legacy Systems
From minor enhancements to complete custom code remediation projects.
Custom Code Development
Reports, module pools, OO-ABAP, CDS views, RAP, and AMDP – cleanly documented and testable.
Extensions & Enhancements
BAdIs, user exits, enhancement spots, and extensions within SD, MM, FI, and PP environments.
Interfaces & Integration
IDoc, RFC, OData, proxies, and REST connections to third-party systems, PI/PO, and Integration Suite.
S/4HANA Migration
Custom code analysis via ATC, remediation, simplification items, and migration of legacy code.
Performance Optimization
SQL tuning, code pushdown, SAT/ST05 analyses, and offloading long-running batch jobs.
Code Quality & Reviews
ABAP Test Cockpit, unit tests, and Clean ABAP guidelines. I rigorously test custom developments from a user perspective and safeguard edge cases – ensuring error-free transports with zero surprises in production.
Experience Across All Common Releases
Whether historically grown R/3 or newly introduced S/4HANA On-Premise – I quickly adapt to existing landscapes.
- SAP R/3 4.6C – 4.7 Legacy maintenance & analysis
- SAP ECC 6.0 / EhP 1-8 Core development & support
- SAP S/4HANA On-Premise RAP, CDS, Clean Core
- SAP NetWeaver AS ABAP Basis-level development
Technologies
Clear Process, No Surprises
From the initial analysis through planning and implementation to final handover – structured, transparent, and with clear expectations for effort and outcome.
Analysis
A brief discussion regarding the system, release, and requirements – including an honest feasibility assessment.
Concept & Estimation
Detailed technical concept featuring a transparent effort estimation, milestones, and acceptance criteria.
Implementation
Development within the customer system or via remote access – transport-compliant and according to naming conventions.
Handover
Documentation, unit tests, knowledge transfer, and comprehensive support during go-live.
Projects thriving in daily operations
Selected highlights from customer projects – anonymized, as most engagements are under NDA.
Architecture and Migration of Form Layouts to Smart Forms
Conception of the migration strategy for legacy SAPscript forms and their corresponding print programs. Redesign of the logic and development of a future-proof, modularized form architecture based on Smart Forms including data retrieval.
- SAPscript to Smart Forms Migration
- Redesign of Print Programs
- Modularization of Data Retrieval
Architecture and Implementation of an EDI/IDoc Interface for Subsystem Integration
Conception and full-stack development of a highly available interface architecture for real-time integration of external logistics service providers. Design of custom IDoc types and implementation of the complete inbound and outbound processing including automated error monitoring.
- Interface Design (EDI / IDoc)
- Enhancement of SAP Standard (MM/SD)
- Automated Error Handling
Redesign of the Custom Enhancement Concept in the SAP Standard
Architectural analysis and remediation of historically grown modifications within sales order processing. Conception and technical implementation of a zukunftssichere/future-proof extension architecture through the consistent use of the modification-free SAP Enhancement Framework.
- Replacement of Modificatory User Exits
- Utilization of BAdIs & Enhancements
- Ensuring Release Upgrade Capability
Architecture and Technical Guidance for SAP EhP Upgrades
Conception and execution of technical upgrade projects. Analysis of legacy custom developments for targeted modification adjustment (SPAU/SPDD) as well as securing system stability and process continuity post-upgrade.
- Upgrade Support & SPAU/SPDD
- Remediation of Legacy Modifications
- Securing Critical Core Processes
Architecture and Development of a SAP GUI Application for Maintenance Planning
Conception and full-stack development of an integrated SAP GUI application to replace a legacy Lotus Notes workflow, as well as the design and implementation of approval and processor workflows for large-scale machinery maintenance.
- Software Architecture & ABAP OO
- SAP GUI (Dynpro / ALV Grid)
- SAP Business Workflow
Analysis and Performance Optimization of a Critical Billing Run
Architectural analysis and deep refactoring of a business-critical batch job. Reduction of database load through targeted SQL tuning, optimization of internal memory management, and index adjustments.
- Runtime Reduction: 6.5 h → 42 min
- Performance Analysis (SAT / ST05)
- SQL Tuning & Memory Optimization
Architecture and Execution of Custom Code Remediation Prior to System Conversion
Strategic analysis and architectural evaluation of approx. 4,800 custom developments using the ABAP Test Cockpit (ATC). Conception of the remediation strategy aligned with the SAP Simplification List, alongside agile resolution of business-critical findings prior to the S/4HANA transformation.
- 4,800 Objects Analyzed & Prioritized
- 610 Critical Findings Resolved
- Successful Go-Live Without Defect Tickets
Architecture and Setup of an S/4HANA Evaluation Environment
Technical conception, installation, and configuration of an internal S/4HANA sandbox system. Evaluation of new data models, architectural patterns, and features prior to client projects for internal knowledge consolidation.
- S/4HANA System Setup (Sandbox)
- Evaluation of New Architectural Patterns
- Hands-On Knowledge Building
Architecture and Development of Data Import Tools for Logistics Processes
Conception and full-stack development of three tailored Excel import applications for the automated creation of contracts, deliveries, and purchase orders. Design of an integrated live data validation process and automated multi-sheet template generation for process optimization.
- Architecture of 3 Import Tools
- Automated Template Generation
- Live Data Validation Post-Import
Project or Capacity Bottleneck?
Briefly describe your system, release, and requirements – you will receive an assessment regarding feasibility, effort, and availability within 24 hours. Remote work across Germany, on-site by arrangement.