About me, short story
Hi, I'm Sven – a passionate developer focused on modern .NET technologies, Blazor, Web APIs, and app development. I enjoy writing clean, well-structured code, building maintainable systems, and ensuring stability through automated testing. While backend development is my main strength, I'm also experienced in frontend and mobile projects. Over the past few years, I've had the opportunity to help create practical software solutions at various companies – from internal warehouse management systems to e-commerce platforms and successful learning apps. If you'd like to learn more about my past projects, just scroll down.

Developer
I started my career in electrotechnic and worked in the electronic development for a year. Here my interest on computer and systems grow. Therefore i also wanted to do develop mysqlf in the informatic area and decided to study Business Informations Systems
- Birthyear 1992
- Age: 33
- Ciudad: Würzburg, Germany
- Trabajo: Developer
- Empresa: LOXXESS IT Services GmbH
- Studium: Business Information Systems
- Correo electronico: hello@herrmannsven.de
- Freelance: disponible
Techstack
Frameworks: .NET, .NET Core, Blazor, Xamarin.Forms, WPF, Xamarin, ASP.NET, Windows Forms, Entity Framework, Mono
Lenguas: C#, HTML, CSS, JavaScript, jQuery, Java, php
Tools: Visual Studio, Tortoise SVN, SQL Server Management Studio, MS Office, Adobe XD, Xamarin, Android Studio, Git
Erfahrungen bei 3wplusP GmbH
In my role at 3wplusP, I implemented various software projects and optimized existing systems:
- Blazor web project for book management – "Cynthy"
As part of my work, I contributed to the redevelopment of an internal tool. The goal was to replace an existing desktop application, previously only accessible via the corporate VPN and focused solely on functionality, with a modern, platform-independent web application. The original tool allowed users to upload manuscripts and automatically generate audio files via an internal API – structured into chapters and subchapters like a real book.
Project goals for the new web app:- Migration of existing features into a modern Blazor web application
- Platform independence (responsive design for desktop, tablet, and smartphone)
- Centralized deployment without local installations (always up-to-date)
- Improved user experience through a modern and intuitive UI
My responsibilities in the project:- Fullstack development of the application using Blazor:
- Frontend: Implementation of a user-friendly interface for managing books, chapters, and text sections
- Backend: Development of a custom RESTful API for communication with the database and audio API
- Implementation of a custom web audio player with a highlighting feature for individual text sections, useful for corrections, feedback, or focused playback
- Design and implementation of a structured content editing system (CRUD for books, chapters, and passages)
- Ensuring responsiveness for mobile usage on smartphones and tablets
- Close collaboration with internal stakeholders for ongoing requirements analysis and tool refinement
- Implementation of document management using BookStack: Analysis, installation, maintenance, and employee training for an efficient open-source DMS.
- Implementation of a ticket system using Zammad: Evaluation, setup, and maintenance of a company-specific support system, including training sessions.
- Development of an XML-PDF validator: Creation of a tool to validate XML data against company-specific rules, with error display directly in the PDF.
- nopCommerce webshop customization: Integration of company-specific logic and customer workflows, including core customizations while preserving upgradability.
Techstack
Frameworks: .NET, .NET Core, Blazor, ASP.NET, Windows Forms, Entity Framework
Lenguas: C#, HTML, CSS, JavaScript, php
Tools: Visual Studio, Tortoise SVN, SQL Server Management Studio, MS Office, Git
Erfahrungen bei Loxxess GmbH
Software Development at Loxxess – Warehouse Management System and Automation
Loxxess is one of Germany’s leading logistics service providers and serves major clients such as dm-drogerie markt. In this fast-paced environment, quick, precise, and error-free information processing is essential – especially since many warehouse processes are already highly automated. Even minor mistakes can lead to delivery delays or incorrect order contents.
The company relies on a proprietary warehouse management system (WMS), which is continuously developed and optimized to meet the high demands of daily operations.
Technological Environment:
- Modular microservice architecture, allowing targeted updates to specific system components efficiently and with minimal risk
- Test-driven development (TDD) with extensive unit and integration test coverage to identify errors early and ensure system reliability
- Highly structured CI/CD processes that enable fast deployment and quality assurance
My responsibilities in this project:
- Development of ASP.NET Core Web APIs to extend and optimize WMS functionality
- Implementation of business logic components closely integrated with automated warehouse processes
- Test automation: Creating and maintaining unit and functional tests based on a test-driven development approach
- Contributing to Blazor projects for developing modern web frontends for internal tools and warehouse/logistics interfaces
Techstack
Frameworks: .NET Core, Blazor, ASP.NET, Entity Framework
Lenguas: C#, HTML, CSS, JavaScript
Tools: Visual Studio, Git, SQL Server Management Studio, MS Office
Erfahrungen bei 4Sellers GmbH
Software Developer at 4Sellers GmbH – E-Commerce Platform & Webshop Solutions
My most recent position was at 4Sellers GmbH in Rain am Lech (Bavaria), a leading provider of comprehensive e-commerce solutions for medium-sized businesses. With 4Sellers, customers manage their entire online business through a central platform – from webshops and inventory management to logistics. The goal is to provide future-proof and high-performance systems that can adapt flexibly to market demands.
I worked in the webshop systems department, where we provided our clients with modern, customizable webshops. The range includes both standardized base solutions and fully customized extensions tailored to specific business processes and product structures.
My role and responsibilities:
- Development and maintenance of backend components for our webshop solutions based on .NET Core
- Integration and extension of existing services to meet client-specific requirements for product display, shopping cart, checkout, and user management
- Integration of external interfaces (e.g., payment providers, ERP systems, shipping services)
- Optimization of existing database queries and extension of the Entity Framework model
- Close collaboration with frontend developers and project management to coordinate new features
- Active involvement in the further development of our Blazor components for internal tools and user interfaces
Techstack
Frameworks: .NET Core, Blazor, ASP.NET, Entity Framework
Lenguas: C#, HTML, CSS, JavaScript
Tools: Visual Studio, Git, SQL Server Management Studio, MS Office
Erfahrungen bei Iris-Solutions GmbH
App and Web App Development at Iris-Solutions GmbH – Blazor, Xamarin & Custom Client Solutions
At Iris-Solutions GmbH in Würzburg (Bavaria), I worked for around three years as a fullstack developer, focusing on web applications, mobile apps, and tailored software solutions. The company specializes in building modern applications in the fields of education, healthcare, and digital services.
A key part of my work involved developing Blazor Server applications and .NET backend solutions for various client projects. I was involved in both the technical planning and the practical implementation, working closely with clients and project managers to understand requirements and deliver efficient, customized features.
One particularly successful project I contributed to was the Büffeln One app, part of the well-known Bueffeln.Net app group. This educational app is widely used by students across Germany. I played a key role in its continued development, especially in integrating new features. The app was built using Xamarin, allowing it to run cross-platform on both iOS and Android.
In addition, I provided technical support and contributed to the further development of an ASP.NET project created in collaboration with a hospital and as part of a clinical study. In this medical context, I was responsible for both backend and frontend development, ensuring the system operated reliably, was user-friendly, and met data protection standards. Coordinating with medical professionals and research partners was especially important in this setting.
My key areas of focus during this time:
- Development and maintenance of web applications using Blazor Server and ASP.NET
- Mobile app development with Xamarin for Android and iOS (Büffeln One)
- Backend and frontend development for medical web systems
- Close collaboration with clients on custom software projects
- Technical support and troubleshooting during live operation
Techstack
Frameworks: .NET, .NET Core, Blazor, Xamarin.Forms, WPF, Xamarin, ASP.NET, Windows Forms, Entity Framework, Mono
Lenguas: C#, HTML, CSS, JavaScript, jQuery, Java, php
Tools: Visual Studio, Tortoise SVN, SQL Server Management Studio, MS Office, Adobe XD, Xamarin, Android Studio, Git
Raspberry Pi 
Private Projekte die ich gerne mit Raspberry Pi oder Raspberry Pi Pico umsetze
Mit dem Raspberrys kann man sehr gut in Python oder MicroPython einsteigen.
Contact
If you have any question you can contact me here