Projects and architectural work.

This is a structured overview of projects I have worked on across different domains and contexts. Not all projects are equally relevant — but together they reflect how I approach real-world systems.

Projects

Strategic Transformation Programs

Modernization of a Leasing Company – Target Architecture & Prototyping

Design of a scalable, group-compatible target architecture including a prototypical end-to-end use case implementation (Spring Boot + Spring AI + Vaadin).

Solid decision basis for modernization and tool strategy including ROI assessment of AI usage.

Key Contributions
  • Designed target architecture (cloud blueprint, integration architecture, data flows)
  • Elaborated DDD domain map and capability model
  • Implemented architecture prototype with Java/Spring + Spring AI + Vaadin
  • Established communication and decision format for management
Strategic Transformation Programs

Modernization of an ERP/Leasing Core System – Parallel Operation & Cloud Adoption

Replacement of an ERP system from the 1980s with a cloud-native greenfield application during live operations with bidirectional synchronization.

Scalable foundation for digital business models, remote work, and accelerated releases.

Key Contributions
  • Designed architecture for parallel operation and data synchronization
  • Re-modeled domains (DDD) and built integration layer for legacy
  • Designed cloud migration on-prem → AWS including security and IAM
  • Defined operations and deployment strategy (GitOps/DevOps)
Strategic Transformation Programs

Strategic Advisory for a Leasing Company – Digital Strategy & Cloud

Holistic modernization of the IT landscape including SAP S/4HANA preparation, make-or-buy analysis, and capability model.

Clearly structured transformation roadmap and secured investment decisions.

Key Contributions
  • Developed digital strategy and cloud strategy (AWS)
  • Facilitated make-or-buy analyses
  • Defined business capability mapping and EA governance
  • Created decision papers for management and supervisory board
Architecture Assessments & Consulting

As-Is Architecture & Digital Strategy – Mechanical Engineering

Capturing the current system landscape and developing a stakeholder-appropriate digital strategy for the executive board and owning family.

Clear roadmap for digital initiatives; consistent communication within the leadership body.

Key Contributions
  • Captured system landscape through workshops
  • Built communication blueprint and management reporting
  • Prioritized strategic action areas
Architecture Assessments & Consulting

Architecture Assessment – Leasing

Assessment of custom software from a service provider including risks, architecture decisions, and recommendations for action.

Solid basis for selection/replacement decisions and contract management.

Key Contributions
  • Conducted architecture assessment within a team of 4 EAs
  • Analyzed decision and process quality of the service provider
  • Identified and prioritized strategic options
Architecture Assessments & Consulting

Modernization Consulting – Leasing (DORA/BaIT, Roadmaps, Make-or-Buy)

Workshops, roadmaps, DORA/BaIT governance, architecture sketches, and make-or-buy support.

Accelerated decision-making and regulatory certainty.

Key Contributions
  • Developed implementation roadmaps
  • Evaluated DORA/BaIT compliance
  • Delivered make-or-buy templates
Software & TechLead

Greenfield Development of a Leasing Portal (AWS, Java, Angular)

Replacement of a dealer portal with big-bang migration; integration into cloud strategy and enterprise architecture.

Stable go-live with rapid dealer migration; foundation for future projects.

Key Contributions
  • Designed architecture and cloud integration
  • Drove usability and performance improvements in the Angular frontend
  • Integrated output management
Software & TechLead

Hybris Webstore – Global Relaunch (170 Countries)

New SPA frontend (Angular) and serverless backend services (AWS Lambda) with headless CMS (Contentful).

Globally fast delivery and improved content autonomy.

Key Contributions
  • Overall technical responsibility and architecture leadership
  • Edge caching and performance strategy for first visit
  • Established public APIs for third-party providers
Software & TechLead

Microservice Platform for Charging Stations (AWS ECS)

Distributed platform for managing and administering charging stations; asynchronous communication and robust error handling.

High robustness, scalability, and future extensibility.

Key Contributions
  • Designed asynchronous architecture and messaging
  • Integrated Keycloak as IdP
  • Harmonized real-time WebSocket handling with microservices
Software & TechLead

Central Master Data System in Retail

Extension of the central master data application; suppliers manage articles via UI, Excel, or XML.

Higher data quality and more efficient master data processes.

Key Contributions
  • Extended RAP/EMF UI; implemented Excel/XML import/export
  • Extended REST services and Spring-based backend logic
  • Optimized data persistence via JPA/Hibernate on Oracle
Software & TechLead

Research Project E-Mobility – Distributed Optimization Heuristic

Calendar optimization within a research project (BiE); distributed heuristic for an NP-hard problem.

Significantly reduced runtimes with high solution quality.

Key Contributions
  • Mapped problem to acyclic traveling salesman problem with time windows
  • Implemented distributed heuristic in Vert.x/Java
  • Created AngularJS UI; used Redis as cache

If you want to discuss architecture, modernization, or AI-native systems — let's talk.

Work with me