Senior Full-Stack Engineer -

I help companies with heavily customized SAP systems to reduce technical debt, get ready for S/4HANA and move towards a clean, upgrade-friendly core. That typically means refactoring legacy ABAP, stabilizing critical interfaces, and designing API-driven architectures that play nicely with cloud and non-SAP systems.

My background: 20+ years in enterprise and web development, with recent years focused on ABAP Objects, CDS/OData, SAP BTP, UI5/Fiori and API-centric integration scenarios.
I help organizations that are stuck between a heavily customized ECC system and the pressure to move towards a lean, upgradeable S/4HANA and cloud landscape.

If you’re looking at S/4HANA or already there, you probably see at least some of these challenges:

I help organizations modernize heavily customized SAP landscapes by combining clean‑core architecture, code remediation, robust integration design, and modern user experiences. That means defining target architectures that keep your S/4HANA core close to standard, moving extensions into the right layers (in‑app, ABAP Cloud, and BTP side‑by‑side), and systematically transforming custom code so it becomes upgrade‑safe and maintainable again.

Along the way, I replace fragile point‑to‑point interfaces with API‑driven OData/REST integrations that work across on‑prem and cloud, and build Fiori/UI5 and web frontends that match real business processes.

I think and work like an architect, not just a developer: clear target architecture, step‑by‑step roadmap, and honest trade‑offs instead of “just one more custom enhancement”. I speak the language of both business and IT, and I’m used to turning vague modernization goals into concrete, deliverable work packages.

That means I do not just look at ABAP code in isolation, but at how custom code, extensions, interfaces and platform decisions fit together in a maintainable target architecture.

Here are many strong ABAP developers. What I offer is a specific mix of roles:

Lead technical modernization and digital transformation of a multi-site vacation rental platform based on Drupal.

Designed a modernization roadmap for a legacy Drupal platform architecture, including API-driven integrations and service-oriented design, cloud-based infrastructure strategy, developed API-driven integrations and supported digitalization initiatives across booking, content and operational workflows.

SAP development role focused on modernization and integration in S/4HANA-related projects. Improved backend API interfaces in an S/4HANA project to increase integration readiness and maintainability, supported productive web services during hypercare in the FI environment and refactored a SAP Business Suite Dynpro application into object-oriented ABAP for better maintainability and future S/4HANA compatibility in an IS-U context.

Worked closely with business stakeholders, solution managers and developers to align implementation with functional requirements.

SAP consulting and development with focus on ABAP, UI5, Fiori, S/4HANA, SAP BTP and modern extension models.

Developed and enhanced SAP applications using ABAP, CDS, OData and UI5, contributed to ERP-to-S/4HANA migration projects, refactored existing applications and worked on side-by-side and developer extensibility scenarios in S/4HANA Public Cloud.

Full-stack development in an Industry 4.0 environment with React frontends, PHP backends, API integration and Linux-based infrastructure.

Successfully converted an outdated PHP web application to a modern PHP REST backend and connected it to a newly created React web frontend including database modelling.

Long-term responsibility for full-stack web development, operations, optimization and technical infrastructure.

Developed and maintained websites and web applications with PHP, Drupal, HTML and CSS, managed Linux and network environments and improved traffic, performance and usability through technical SEO and usability-focused optimization.

Intensive, practice‑oriented software architecture 5‑day training based on the iSAQB CPSA‑F curriculum. Covered fundamentals of software architecture, architectural styles and patterns, quality attributes, documentation, and communication with stakeholders. Included exercises on modularization, domain‑driven design, and designing scalable, maintainable systems in heterogeneous environments such as cloud, web, and enterprise platforms.

iSAQB CPSA-F Foundation Level training completed; exam planned for Q4/2026

Intensive agile project management (Scrum) training at Indisoft GmbH (Leipzig) with focus on Scrum and Kanban (05/2020–06/2020). Covered Scrum roles, events, and artifacts, agile planning and scaling, Scrum simulations in practice, and Kanban principles such as WIP limits and continuous improvement. Successfully completed the program and obtained the Professional Scrum Master I (PSM I) certification from Scrum.org on June 8, 2020.

One‑year, practice‑oriented Full‑Stack Web Developer program in Leipzig (01/2020–01/2021) covering modern web development with HTML5, CSS3, JavaScript, jQuery/AJAX, PHP, and MySQL, combined with Linux/server administration and content‑management systems. The curriculum included responsive web design, WordPress and TYPO3 for developers, e‑commerce and shop systems, SEO/SEA, social media marketing, and project work, linking technical implementation with online visibility and performance optimization. The training built directly on and further professionalized my long‑term experience as a webmaster and Drupal/PHP full‑stack developer for fincaferien.de, including topics such as technical SEO, usability, and scalable web architectures.

Two‑year vocational apprenticeship as an Industrial Clerk in Hildesheim, providing a solid foundation in business processes, commercial management, and office administration. The program covered fundamentals such as accounting, cost and performance calculation, procurement, order processing, and customer communication, giving me a practical understanding of how companies operate and make decisions. This early business education has shaped my entire career by enabling me to connect technical solutions with real commercial requirements and organizational structures.