Jürgen Koller

SwiftUI Software Developer

Heilbronn, Germany

Experience

Jan 2022 - Present
2 years 7 months

SwiftUI-Software-Entwickler

  • Complete implementation of the macOS app 'PDF Content Search' and the iOS app 'PDF Cnt Search' from initial concept through final App Store release
Jan 2021 - Dec 2022
1 year

Swift-Software-Entwickler

  • Developed a utility app for macOS using Xcode and SwiftUI
  • Technologies used: OCR, SQLite, cloud services, SwiftNIO
  • Released the 'PDF Content Search' app on the Apple macOS App Store
Jan 2020 - Dec 2022
2 years

Xamarin Frontend-Entwickler

  • Member of a Scrum team as a Xamarin frontend developer
  • Implemented user stories for features provided via an external cloud service
  • App enables access to household appliances
Jan 2020 - Dec 2021
2 years

Xamarin-Software-Entwickler

  • Collaborated in a 9-member team (frontend, backend, QA, UI/UX)
  • Agile Scrum approach for continuous implementation of user stories
  • Developed a Xamarin Forms Shell application for iOS and Android
Jan 2019 - Dec 2020
2 years

Xamarin-Software-Entwickler

  • Sole developer responsible for a Xamarin app update with native UI for iOS and Android
  • Full development and release process
  • Collaborated with UI designer and project manager
Jan 2018 - Dec 2020
2 years

Xamarin-Software-Entwickler

  • Developed a new mobile client for SAP systems (Xamarin Forms iOS, Android)
  • Supported a .NET team (5 developers) with Xamarin
  • Created the XAML user interface with dynamically programmed elements driven by Entity Framework
Jan 2018 - Dec 2019
1 year

Xamarin-Software-Entwickler

  • Ported an Android app to Xamarin with a shared codebase for Android and iOS
  • Applied the MVVM pattern
  • Used mobile services, data persistence, and Bluetooth communication
  • Lead developer responsible for the entire development cycle
Jan 2016 - Dec 2017
1 year

Xamarin Frontend-Entwickler

  • Worked with a .NET team (frontend, backend, QA, UI/UX) in Scrum
  • Shared Xamarin expertise and achieved a successful project kick-off
Jan 2015 - Dec 2016
1 year

Xamarin-Software-Entwickler

  • Added new features and fixed bugs in an existing Xamarin Android app with native UI
Jan 2015 - Dec 2016
1 year

Xamarin-Software-Entwickler

  • Developed a new Xamarin app from scratch with native UI for iOS and Android
  • Backend integration and background services such as GPS tracking
Jan 2015 - Dec 2016
1 year

Xamarin-Software-Entwickler

  • Ported a Windows Phone app to Xamarin (iOS, Android, Windows Phone)
  • Planned and executed the port as a sole developer within time and budget constraints
Jan 2015 - Dec 2015
1 year

Xamarin-Software-Entwickler

  • Developed a new Xamarin iOS and Android app for contacting government officials
  • Used Azure push notifications
Jan 2015 - Dec 2015
1 year

Xamarin-Software-Entwickler

  • Integrated an existing Xamarin Android app with a new backend REST API service
Jan 2014 - Dec 2015
1 year

Xamarin-Software-Entwickler

  • Developed a Xamarin iOS, Android, and Windows Store app for BORT medical with 100% offline functionality
  • Technologies: Xamarin C#, native UI, SQLite, custom data synchronization, offline HTML layout rendering for product presentations
Jan 2010 - Dec 2014
3 years

Mac Objective-C-Entwickler

  • Developed a native macOS app in Objective-C for peer-to-peer data transfer without cloud services
Jan 2010 - Dec 2014
3 years

Mac, iOS Objective-C-Entwickler

  • Developed the macOS server application MyPicServer and the client app MyPic in Objective-C
  • Distributed photos to smartphones for professional photographers
  • Available on the App Store
Jan 2010 - Dec 2013
2 years

Mac, iOS Objective-C-Entwickler

  • Developed a new iOS app for BORT medical with 100% offline functionality to deliver product news

Languages

German
Native
English
Advanced