About me / Lars Düwel
Building software.
Taking ownership.
I'm Lars Düwel, a Freelance Software Engineer based in Berlin. I offer development across the .NET stack: backend services and APIs, mobile and cross-platform applications – from requirements to reliable operation.
- Location
- Berlin, Germany
- Languages
- German · Native
English · Business fluent
- 15+
- Years of hands-on experience
- Since 2023
- Working independently
- Full-stack .NET
- Backend · APIs · Mobile · Desktop
01 / Expertise
From the details to the whole system.
I develop .NET solutions from backend to interface: architecture, services and APIs, mobile and desktop applications, testing, and integrating services and hardware.
Mobile & Desktop
Cross-platform applications for iOS, Android and Windows, and the modernization of existing Xamarin.Forms and UWP solutions.
.NET Backend & APIs
Backend services and APIs with C# and ASP.NET Core, data access with Entity Framework, and integration with services and devices.
Quality & delivery
Automated tests and CI/CD accompany development. Performance and accessibility are part of product quality.
02 / Selected experience
Experience in the real world.
Selected work in defence, healthcare, logistics and connected products.
Smart Home · since 2025
Miele
Design, development and testing of a smart-home dashboard for iOS and Android, with a focus on performance and accessibility.
C# · .NET MAUI · XAML · NUnit · GitLab CI
Defence / Military · 2023–2026
Rheinmetall Electronics
Modernization of multiple projects and migration from UWP to .NET MAUI for Windows and Android, including service communication and integration of connected services and hardware.
.NET MAUI · UWP · WinUI 3 · Windows · Android
Digital Health · 2018–2023
Biotronik PatientApp
Development and modernization of a patient application for iOS and Android. Migration of the Xamarin.Forms codebase to .NET MAUI, supported by automated tests covering each user story.
.NET MAUI · MVVM · Appium · Azure DevOps
Logistics · 2020–2021
DHL IT Services
Mobile applications for recording journeys, reporting accidents and defects, and reading receipts on Android devices.
Xamarin.Forms · MVVM · Redux · Android
03 / My journey
Software is my craft.
I've worked in software development since 2007. My vocational qualification in application development provides the foundation, built on through practical experience across industries.
- Since 06/2023
Freelance Software Engineer
- 11/2021–05/2023
Senior Software Engineer
- 06/2020–10/2021
Senior Software Engineer
- 08/2018–05/2020
Consultant / Senior Software Engineer
- 10/2015–07/2018
Senior Mobile Developer
- 07/2012–09/2015
Mobile Developer
emotion touch
- 06/2007–06/2012
Software Developer
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.