Karl Forstner-Software / Data Engineer
Check rate
Experience
ONECEPT Website
ONECEPT GmbH
Development and implementation of the website onecept.at using React/Next.js. Focus on responsive web design, high-performance component structure, basic SEO optimization, and technical deployment.
Technologies: React, Next.js, TypeScript / JavaScript
ONE-PATH Website
ONECEPT GmbH
Development and implementation of the website one-path.one using React/Next.js. Focus on responsive web design, high-performance component structure, basic SEO optimization, and technical deployment.
Technologies: React, Next.js, TypeScript / JavaScript
ONE ACADEMY Development
ONECEPT GmbH
Training platform focusing on clear learning paths, centralized knowledge transfer, and scalable content.
Technologies: ASP.NET Core Web API, React, .NET C#, TypeScript / JavaScript
Atlassian Consulting & Implementation
VBV – Betriebliche Altersvorsorge AG
Comprehensive project in the customer's Atlassian environment involving consulting on best practices, analysis, creation of work packages, conception and implementation, workshops, and setting up an audit board including automations. Additionally, potential Atlassian apps for customer processes were identified, Confluence page templates were created, and a structural concept for departments and teams in Confluence was developed.
ERP Extension with External API Integration
CIO.pro e.U.
Extension of an existing ERP system, where the ERP performs automated API calls to an external system in order to reliably transfer order data.
Automated development of processes for XML invoice formats
CIO.pro e.U.
- Automated reading and validation of XML invoice formats (e.g. ebInterface, UBL, EBOR)
- Structured transfer of data to an ERP system
- Implementation with .NET and C#
Founder | Software Engineer / Architect
Forstner Software Solutions e.U.
- Development of custom .NET and C# software solutions
- Modernization of existing systems from concept and development to cloud deployment in Azure
- Focus on high-performance, future-proof B2B software with AI-powered features
- Close collaboration with customers to optimize business processes and increase efficiency
Software Engineer
ONE-PATH Solutions | ONE-CODE
- Technical implementation of ONE-PATH as part of ONE-CODE.ONE
- Development of secure, scalable applications from prototypes to production-ready systems
- Architecture and programming of platforms
- Integration of data and knowledge
- Development of AI-powered solutions for daily work
One-Hub development of a scalable data hub
Onecept GmbH
- Development of a scalable data hub in the ONECEPT ecosystem for data integration and structuring
- Focus on modular architecture, API integration, and Blazor-based frontends
- Integration of AI features such as semantic search (RAG), role and user management
- Flexible deployment options (cloud or on-premise) and GDPR-compliant use
Kiway web application with AI
Techexx GmbH
- Architecture, concept, and implementation of a large web application for mapping internal processes with AI
- Independent implementation of frontend, backend, and data model
- Deployment in Azure incl. migration of the self-hosted environment
- Technologies: ASP.NET Core Web API, .NET Blazor WASM, MudBlazor, SignalR, Azure Container Apps, PostgreSQL, Playwright.NET, xUnit
Software Engineer
Techexx GmbH
- Design, architecture, and development of business software based on ASP.NET Core Web API, Blazor WebAssembly, and PostgreSQL
- Programming in C# and JavaScript
- Data modeling and API integration
- Project coordination with Jira
- Deployment with Docker and Azure Container Apps
- Quality assurance through unit and integration tests (Playwright.NET, xUnit)
MS SQL Server Migration
Mediashop GmbH
- Migration from MS SQL Server 2016 to 2022, including SSIS and SSAS upgrade
- Adjustment of database drivers and development of new logic for changed data type return values
FitMatch App Development
Privater Kunde
- Development of an app to connect people who enjoy sports, with a focus on shared activities and social interaction
- Involvement in concept, UX/UI, frontend and backend development, as well as market analysis and strategy
- Integration of premium features, event bookings, and personalized fitness data
- Technologies: ASP.NET Core Web API, .NET MAUI Blazor, MudBlazor, Azure App Services, Azure PostgreSQL
Software Data Engineer
Mediashop GmbH
- Further development of the data warehouse and automation of data processes with SSIS and SSAS
- Development of new logic to adapt to changes in data type return values
- Creation of management reports and dashboards with Power BI
- Optimization of SQL queries and automation of reporting processes to increase efficiency
- Maintenance of the internal DWH
ETL & Reporting Development
Mediashop GmbH
- Development and automation of SSIS pipelines and reporting structures
- Creation of reports with Power BI and maintenance of the internal DWH
- Improvement of the efficiency and quality of data processes to support data-driven decisions
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Retail, and Sport.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Project Management, Business Intelligence, Quality Assurance, and Strategy.
Summary
Karl Forstner combines modern software development with data engineering and technical system architecture. His focus lies on developing scalable platforms, applications, ETL pipelines, and data solutions, as well as integrating structured and unstructured data into productive enterprise systems. As the commercial managing director of ONECEPT GmbH and lead developer of the ONE-HUB product, he guides projects from conception and architecture through to productive cloud and on-premise deployments.
Skills
- .Net / Asp.Net Core
- Fullstack Development
- Software Architecture
- Blazor / C#
- React
- End-To-End Implementation Of Modern Web Applications
- Modular, Scalable System Designs
- Javascript / Rest Apis
- Postgresql / Mssql
- Etl Pipelines
- Api Development
- Data Integration And Transformation Processes
- Rest Apis And Ssis / Ssas
- System Integration
- Docker / Azure
- Hub Systems
- Ai Integration
- Signalr / Playwright.Net
- Integration Of Data, Knowledge, And Processes
- Ai-Powered Features For Businesses
- Xunit
Languages
Education
HTBLuVA Wiener Neustadt
HTL-Matura / High School Graduation and Diploma Exam · Information Technology
Focus on software development, databases, network technology, and IT systems. Practice-oriented education with the development of applications and projects in various programming languages, concluding with the high school graduation and diploma exam.
Certifications & licenses
Microsoft Applied Skills: Enhance agents with autonomous capabilities
Microsoft
Microsoft Applied Skills: classes, properties, and methods in C#
Microsoft
Microsoft Applied Skills: Develop an ASP.NET Core web app that consumes an API
Microsoft
Microsoft Applied Skills: Develop generative AI solutions with Azure OpenAI Service
Microsoft
Microsoft Applied Skills: Generate reports with AI research assistants
Microsoft
Statistics
Experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Karl is based in Gleißenfeld, Austria and can operate in on-site, hybrid, and remote work models.
Karl speaks the following languages: German (Native), English (Intermediate).
Karl has at least 4 years of experience. During this time, Karl has worked in at least 14 different roles and for 9 different companies. The average length of individual experience is 3 months. Note that Karl may not have shared all experience and actually has more experience.
Based on recent experience, Karl would be well-suited for roles such as: ONECEPT Website, ONE-PATH Website, ONE ACADEMY Development.
Karl's most recent position is ONECEPT Website at ONECEPT GmbH.
In recent years, Karl has worked for ONECEPT GmbH, VBV – Betriebliche Altersvorsorge AG, CIO.pro e.U., Forstner Software Solutions e.U., and ONE-PATH Solutions | ONE-CODE.
Karl is most experienced in industries like Information Technology, Retail, and Sport. Karl also has some experience in Banking and Finance, Media and Entertainment, and Education.
Karl is most experienced in business areas like Information Technology, Product Development, and Business Intelligence. Karl also has some experience in Project Management, Quality Assurance, and Strategy.
Karl attended HTBLuVA Wiener Neustadt for Information Technology.
Karl has 5 certificates. Among them, these include: Microsoft Applied Skills: Enhance agents with autonomous capabilities, Microsoft Applied Skills: classes, properties, and methods in C#, and Microsoft Applied Skills: Develop an ASP.NET Core web app that consumes an API.
Karl is immediately available full-time for suitable projects.
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Calculated based on our freelancers’ daily rates as of 6 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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