Experience.

Mobile apps and platforms I’ve worked on since going freelance as Ritterfeld in 2016, from business mobility to connected devices.

Client engagements

AIQ, React Native Engineer

Modernised a React Native app, migrated JavaScript to TypeScript and improved Bluetooth connectivity.

Freddi, React Native Engineer

Built the Freddi mobility app with React Native and native mobile integrations.

Reisbalans App, React Native Engineer

Built the Reisbalans app for business travel and expenses; added UI tests and Bitrise CI.

X-Center, .NET MAUI Engineer

Built heat-pump controls in C# and contributed to the Xamarin-to-MAUI migration.

Education platform, iOS Engineer

Extended an education platform in Swift and Objective-C.

WebWeaver, React Native Engineer

Built a Windows learning app with React Native Windows, TypeScript and C#.

ServiceApp, Mobile Engineer

Extended an industrial service app with Xamarin/MAUI, push notifications and OAuth/SSO.

TankApp, Mobile Engineer

Maintained a Xamarin enterprise app, including distribution, UI and client/server changes.

EasyControl / OASE Control, Mobile Engineer

Built a Xamarin/C# app connecting to hardware via Bluetooth and Wi-Fi.

SharePoint-integrated app, React Native Engineer

Built an iOS and Android React Native app with SharePoint integration.

Consultation app, iOS Engineer

Extended an internal Objective-C iOS app for customer consultations and contracts.

Banking app, iOS Engineer

Built Swift banking features for trading and eSafe documents.

Care documentation app, Mobile Engineer

Built a Xamarin/C# app for daily care documentation.

Jinn & Jinn Delivery, iOS Engineer

Developed customer and courier iOS apps, including UX and design.

BeatClip, Mobile Engineer

Worked on the mobile app and backend using Xamarin, Java and Objective-C.