Freelancer profile translated to English.

Description

With 15 years of age, programming was a hobby. For over 30 years, SW development has been a hobby, profession, and calling.

As an IT expert, I move fluently at the intersection of business analysis, software architecture, and fullstack development. I act as a bridge between the business department and technical implementation, especially with complex system landscapes, legacy modernizations, and cloud transformations.

• IT Architecture & System Design: K

o Conception of robust, distributed systems (microservices, SOA, event-driven) using modern approaches (DDD, arc42, ...).

• Business Analysis & Requirements Engineering:

o Structured requirements analysis and transformation of vague user stories into implementable IT specifications.

• Legacy Modernization & Cloud:

o Cloud-agnostic architectures (IaC, API-First) and gentle modernization or replacement of critical legacy systems.

• Data Integration & ETL:

o Migration and integration of complex data sets (RDBMS & Big Data/Hadoop).

• Future-relevant research:

o Practical integration of local LLMs/AI workflows in the software development process.

Industry field of expertise

Languages

German
Native or bilingual
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

Europäische Kommission
Software Architect, Business Analyst
SOFTWARE PUBLISHING
August 2025 - March 2026 (7 months)
Klagenfurt am Wörthersee, Austria
Simpl-Open Project of the European Commission
• Open Source Software (OSS) in the context of DataSpace

Architecture and analysis in the context of DataSpace with the roles
o Infrastructure Provider
o Application Provider, Infrastructure Provider, (Application) Consumer •

User stories and specifications for providing infrastructure
o Cloud agnostic
o API-first approach with OpenAPI
o IaC (Infrastructure as Code) approach

ConceptApplicationSharing/ApplicationConsumption
o Cross-cutting process with different providers: ApplicationProvider, Infrastructure Provider and Consumer
o IaC approach with Ansible/Semaphore UI •

Technical concepts in the Data Space context
o Firewall
o VPN

Data Space Concepts, Eclipse Dataspace Components (EDC), Archimate, UML, OpenAPI, REST, Kubernetes, Argo CD, Crossplane, OpenTofu/Terraform, OpenBao, Kafka, Docker, JIRA, Confluence, Archi, Java, Intellij IDEA, Spring Boot, Ansible, Semaphore UI, Pencil
Data Spaces Archimate OpenAPI Cloud Kubernetes
Kues & Partner KG
Software Architect, Lead Developer
SOFTWARE PUBLISHING
October 2024 - July 2025 (9 months)
Klagenfurt am Wörthersee, Austria
AI and LLM
o Gaining experience, exploring the ecosystem
o Experiments for integration into analysis processes/development processes
o Opportunities, risks, costs, and data security, ...
o Testing local LLMs on own hardware

.NET and C#
o Gaining experience, exploring the ecosystem, ...

Both topics applied in a real-world private project
o Data acquisition of a heterogeneous PV system
o Reverse engineering of existing APIs towards OpenAPI
o Integration test (massive) real and simulated to cover the different devices or ensure coverage

C#, .NET9, OpenAPI, Kiota, REST, MSBuild, IntelliJ Rider, Fronius-API, NUnit, WireMock, Lateapexearlyspeed.Json.Schema, Obsidian
Ollama, Llama.cpp, various (including local) LLMs
.NET Swagger or OpenAPI LLM Artificial Intelligence (AI) C#
BRZ
Software Architect, Lead Developer, Business Analyst
PUBLIC SECTOR
March 2022 - August 2024 (2 years and 6 months)
Wien, Austria
New development of a specialist application for export control, including data migration

Context:
Certain goods are subject to export restrictions
An export requires a permit from the authority
Permit must be applied for
Process support by the application throughout the cycle from application to approval/rejection and compliance monitoring

Activities:
Concept and implementation for ongoing migration
One-time ETL from MS-SqlServer to PostgreSQL as a data basis for further logical migration and to be independent of MS-SqlServer
Logical migration of domain objects as needed
Analysis to further develop requirements/user stories/business processes towards implementability
Development environment based on maven/npm to build and roll out the backend (Java, Spring Boot) three frontends (Angular, Typescript) with various generators
CI/CD established
Role-based access control (RBAC) defined/established based on Spring Security
Auditing/historization based on Envers
Multi-tenancy established based on Hibernate filters etc.
Workflows with Spring State Machine, including the possibility to define state transitions
Connection of special systems for creating documents/correspondence (BKSG)
Designed/implemented DSL for specific forms for both the frontend application and print output (BKSG)
Integration of external systems (WSDL/SOAP, WSDL/JMS)
Import of various master data including lifecycle. Well-structured: customs tariffs/customs codes, goods lists. Unevenly structured: Denials

Business Analysis, Requirements Engineering, Scrum, ARC42, Enterprise Architect, JIRA, Confluence, PostgreSQL, MS-SqlServer, H2, Penthao/Kettle, Spring Boot, Spring Security, Spring Statemachine, Envers, Apache POI, Angular, OpenAPI, SOAP/WSDL, REST, XSD, XPath, Code generators for OpenAPI/WSDL/XSD, Java, Typescript, JUnit, Mockito, Tomcat, Docker, git, maven, npm, NodeJS, Jenkins, Intellij-IDEA, ...
Requirements Engineering PostgreSQL SQL Server Software Architecture Data Migration