Jürgen Koller - SwiftUI Software Developer

Q: Where is Jürgen based?

Jürgen is based in Heilbronn, Germany .

Q: What languages does Jürgen speak?

Jürgen speaks the following languages: German (Native), English (Advanced) .

Q: How many years of experience does Jürgen have?

Jürgen has at least 15 years of experience. During this time, Jürgen has worked in at least 6 different roles . The average length of individual experience is 1 year and 11 months . Note that Jürgen may not have shared all experience and actually has more experience.

Q: What is Jürgen's latest experience?

Jürgen's most recent position is SwiftUI Software Developer .

Q: Which industries is Jürgen most experienced in?

Jürgen is most experienced in industries like Information Technology (IT) , Healthcare , and Sport and Recreation . Jürgen also has some experience in Transportation and Logistics and Government and Public Administration .

Q: Which business areas is Jürgen most experienced in?

Jürgen is most experienced in business areas like Information Technology (IT) , Product Development , and Logistics .

Q: Which industries has Jürgen worked in recently?

Jürgen has recently worked in industries like Information Technology (IT) .

Q: Which business areas has Jürgen worked in recently?

Jürgen has recently worked in business areas like Information Technology (IT) and Product Development .

Recommended expert

Heilbronn, Germany

Experience

Jan 2023 - Present

3 years 2 months

SwiftUI Software Developer

Successfully implemented the entire macOS app 'PDF Content Search' and the iOS app 'PDF Cnt Search' from initial concept to final release in the App Store.

Jan 2022 - Dec 2022

1 year

Swift Software Developer

Developed a utility app for macOS using Xcode and SwiftUI
Technologies used: OCR, SQLite, cloud services, SwiftNIO
Published the 'PDF Content Search' app on the Apple macOS App Store

Jan 2021 - Dec 2022

2 years

Xamarin Frontend Developer

Member of a Scrum team developing an app for accessing household appliances
Implemented user stories for cloud features via an external cloud service

Jan 2020 - Dec 2021

2 years

Xamarin Software Developer

Collaborated in a 9-person team (frontend, backend, QA, UI/UX) using agile Scrum
Implemented all pending user stories into a Xamarin Forms Shell application for iOS and Android

Jan 2019 - Dec 2020

2 years

Xamarin Software Developer

Sole developer responsible for the entire development and release process of a Xamarin app update with native UI for iOS and Android
Collaborated with a UI designer and project manager

Jan 2018 - Dec 2019

2 years

Xamarin Software Developer

Developed a new mobile client for SAP systems with Xamarin.Forms (iOS, Android)
Supported a team of 5 .NET developers in creating a dynamic XAML UI powered by Entity Framework

Jan 2018 - Dec 2018

1 year

Xamarin Software Developer

Migrated an Android app to Xamarin with a shared codebase for Android and iOS
Applied MVVM, mobile services, data persistence, and Bluetooth communication
Responsible for the full development cycle as lead developer

Jan 2017 - Dec 2017

1 year

Xamarin Frontend Developer

Brought Xamarin knowledge into a .NET team (frontend, backend, QA, UI/UX) using agile Scrum
Business domain: Augmented Reality Remote Service
Technologies: Xamarin, C#, Xamarin.Forms, Visual Studio, Visual Studio for Mac, iOS, Android, Windows UWP

Jan 2016 - Dec 2016

1 year

Xamarin Software Developer

Added new features and fixed bugs in an existing Xamarin Android app with native UI
Business domain: Sports and Leisure
Technology: Xamarin C#, Xamarin Studio, Android

Jan 2016 - Dec 2016

1 year

Xamarin Software Developer

Built a new Xamarin app from scratch with native UI for iOS and Android
Integrated backend and background services like GPS tracking
Business domain: Logistics and Transport
Technology: Xamarin C#, Xamarin Studio, iOS, Android

Jan 2016 - Dec 2016

1 year

Xamarin Software Developer

Porting a native Windows Phone app to Xamarin with support for iOS, Android and Windows Phone
Planning and executing the app transfer as the sole developer within the given time and budget constraints
Business area: Logistics and Transportation
Technology: Xamarin C#, Xamarin Forms, Xamarin Studio, Visual Studio, iOS, Android, Windows Phone, SQLite, RESTful service

Jan 2015 - Dec 2015

1 year

Xamarin Software Developer

Connecting an existing Xamarin Android app to a new backend REST API service
Business area: Sports and Leisure
Technology: Xamarin C#, Xamarin native UI, Xamarin Studio, Android, RESTful service, ServiceStack, mopub

Jan 2015 - Dec 2015

1 year

Xamarin Software Developer

Developing a new Xamarin iOS/Android app for citizens to contact government officials
Business area: Citizen Services
Technology: Xamarin C#, Xamarin Forms, Xamarin Studio, Android, iOS, RESTful service, Azure push notifications

Jan 2014 - Dec 2014

1 year

Xamarin Software Developer

Developing a Xamarin iOS, Android and Windows Store app for BORT medical with 100% offline functionality for product news
Client: BORT GmbH, Germany
Business area: Medical Healthcare
Technology: Xamarin C#, Xamarin native UI, Visual Studio, Xamarin Studio, SQLite, custom data synchronization, offline HTML layout rendering

Jan 2011 - Dec 2013

3 years

Mac Objective-C Developer

Developing a native macOS app in Objective-C for peer-to-peer data transfer without a cloud service
Business area: Tools and Utilities
Technology: Xcode, Objective-C, CocoaAsyncSocket

Jan 2011 - Dec 2013

3 years

Mac & iOS Objective-C Developer

Developed a native macOS app in Objective-C for photo professionals to easily share photos via smartphones
Developed the macOS server application MyPicServer and the client app MyPic
Industry: Utilities
Technology: Xcode, Objective-C

Jan 2011 - Dec 2012

2 years

Mac & iOS Objective-C Developer

Developed a new iOS app for BORT medical with 100% offline functionality for product news
Industry: Healthcare
Technology: Xcode, Objective-C

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (12 years), Healthcare (3 years), Sport (2 years), Transportation (1 year), and Government and Administration (1 year).

Information Technology

Healthcare

Sport

Transportation

Government and Administration

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (15 years), Product Development (14 years), and Logistics (1 year).

Information Technology

Product Development

Logistics

Summary

Xamarin / SwiftUI software developer with 13 years of experience in developing mobile applications and 10 years of experience with Xamarin technology.

Skills

Swift
Swiftui
.Net Maui (Xamarin)

Languages

German

Native

English

Advanced

Profile

Created

June 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Jürgen based?

Jürgen is based in Heilbronn, Germany.

What languages does Jürgen speak?

Jürgen speaks the following languages: German (Native), English (Advanced).

How many years of experience does Jürgen have?

Jürgen has at least 15 years of experience. During this time, Jürgen has worked in at least 6 different roles. The average length of individual experience is 1 year and 11 months. Note that Jürgen may not have shared all experience and actually has more experience.

What roles would Jürgen be best suited for?

Based on recent experience, Jürgen would be well-suited for roles such as: SwiftUI Software Developer, Swift Software Developer, Xamarin Frontend Developer.

What is Jürgen's latest experience?

Jürgen's most recent position is SwiftUI Software Developer.

Which industries is Jürgen most experienced in?

Jürgen is most experienced in industries like Information Technology (IT), Healthcare, and Sport and Recreation. Jürgen also has some experience in Transportation and Logistics and Government and Public Administration.

Which business areas is Jürgen most experienced in?

Jürgen is most experienced in business areas like Information Technology (IT), Product Development, and Logistics.

Which industries has Jürgen worked in recently?

Jürgen has recently worked in industries like Information Technology (IT).

Which business areas has Jürgen worked in recently?

Jürgen has recently worked in business areas like Information Technology (IT) and Product Development.

What is the availability of Jürgen?

Jürgen is immediately available part-time for suitable projects.

What is the rate of Jürgen?

Jürgen's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.