Freelance Software Engineer · based in Berlin
Your vision.
Engineered for impact.
I'm Lars Düwel. I help businesses build and modernize .NET solutions – from backend services and APIs to mobile and desktop applications.
- 15+
- Years of hands-on experience
- Full-stack .NET
- Backend · APIs · Mobile · Desktop
- Since 2023
- Working independently
My CV
Experience, skills and projects in a downloadable PDF.
01 / Services
Expertise that moves your project forward.
.NET Backend & APIs
Backend services, APIs and data access with C# and ASP.NET Core. Integration with existing services and systems.
Mobile & Desktop
Cross-platform applications for iOS, Android and Windows, with a focus on performance, maintainability and accessibility.
Modernization
Evolve existing .NET applications and migrate Xamarin.Forms or UWP solutions. Build a sustainable architecture step by step.
02 / Selected work
Experience from demanding projects.
Smart Home
Miele
A connected dashboard for iOS and Android. Development, testing, performance and accessibility.
.NET MAUI · C# ↗Defence / Military
Rheinmetall Electronics
Migration from UWP to .NET MAUI with service communication and hardware integration.
.NET MAUI · Windows · Android ↗Healthcare
Biotronik
A patient app for iOS and Android. Modernization and test coverage for each user story.
.NET MAUI · Appium ↗Further experience in logistics, financial services, payments and telecommunications.
03 / Working together
From requirements to reliable operation.
I support your project from requirements through development, quality assurance and deployment to monitoring and maintenance. Automated tests, CI/CD, logs, metrics and alerts support reliable operation.
More about how I work →- Requirements
- Development
- Quality assurance
- Deployment
- Monitoring & maintenance
Let's talk
Engineering expertise for your next project.
Need expertise or support to build a .NET application, deliver a mobile solution or migrate an existing project? Let's discuss your requirements.