Stephan Sloth Profile Picture

Stephan Sloth

Freelance Mobile Developer

Linkedin Icon linkedin.com/in/stephansloth

stephan@abstraktion.dk

+45 27290644

Summary

I’m a freelance mobile application developer with 10+ years of experience.

My background is rooted in iOS development, where I’ve worked since iOS 7 across 20+ apps in the App Store, ranging from early stage prototypes to large scale apps. In recent years, I’ve taken on senior and lead roles in long-term engagements, including contributing to products with millions of users, while driving feature development, implementing performance improvements, and creating robust CI/CD pipelines.

I have rich experience across the full product development lifecycle, bringing apps from ideas to app stores. More recently, my position as a full stack developer at Kørekort Hack, has given me a strong understanding of how technical decisions connect to product, business, and user outcomes.

I'm currently in the process of evolving from a senior iOS specialist into a more broad mobile developer role, working across both iOS and Android platforms with a primary focus on SwiftUI and Jetpack Compose.

I specialize in building scalable and maintainable mobile architectures with first class performance and stability, translating product requirements into high quality user experiences, and creating test automation and continuous delivery setups.

Through many years of freelancing, I’ve developed a strong sense of ownership and a pragmatic approach to problem solving, balancing technical excellence with real world constraints. I work both independently and as part of teams, often stepping in as a senior resource or technical lead when needed.

Work experience

  • Sep 2025 - Today

    Kørekort Hack (Owner & Full Stack Developer)

    As the owner and full stack developer of Kørekort Hack, I've designed, built, and launched a native mobile application from the ground up, delivering a complete end-to-end product experience on both iOS and Android.

    Kørekort Hack is in active development, with new features launching regularly. My ongoing involvement combines product ownership with hands-on software engineering, including technical architecture, feature prioritization, and user experience design. The result is a high-end mobile application that demonstrates strong full-stack capabilities, modern mobile development practices, and an emphasis on performance, usability, and maintainability.

    I'm responsible for the full development lifecycle, including backend development, concept validation, system architecture, UI/UX design, implementation, deployment, and continuous iteration based on user feedback.

    Skills: iOS · Kotlin · Jetpack Compose · Swift (Programming Language) · SwiftUI · .NET Framework · UI/UX · Docker · Android · RESTful architecture · Git · Mobile Application Development · Full-Stack Development

  • Oct 2017 - Today

    Abstraktion Development (Self-employed)

    I established Abstraktion Development in 2017, to work solely as a freelance developer. I’ve since worked with many clients, both on in-house projects and as an external on-site developer. The more long-term engagements have been outlined in this resume.

    I’ve primarily worked with native iOS development, but have also come across various projects regarding Android development, web development, SEO, online advertising, analytics, hosting etc.

    In the years to come, it is my goal to continue working freelance in a more broad mobile developer role, working across both iOS and Android platforms, with a primary focus on SwiftUI and Jetpack Compose.

    Skills: Freelancing

  • Jun 2020 - Jul 2024

    Frameo (Freelance iOS Developer)

    For a total of 33 months between mid 2020 and mid 2024, I worked as a freelance iOS developer at Frameo in Aarhus. As part of their continuously growing development team, I was the leading iOS developer for a 2-year period, working on their app with more than 3 million downloads across iOS and Android.

    My main responsibilities were:

    • - Implementation of new features.
    • - Performance optimisation.
    • - Maintenance and bug fixing.
    • - Security assessment.
    • - Creating and maintaining UI and unit tests.
    • - Creating and maintaining a solid continuous delivery setup.
    • - Providing guidance and knowledge in relation to iOS, Apple platforms and SwiftUI.

    Skills: Freelancing · Git · UIKit · CocoaPods · SwiftLint · SwiftUI · Swift (Programming Language) · Fastlane · XCTest · SPM · Jenkins · Core Data · Objective-C · Dependency Injection

    Contact: Carsten Nielsen [ linkedin.com/in/cnile ] - CEO

  • Nov 2018 - Mar 2024

    Vertica, Aarhus C Dept. (Freelance iOS Developer)

    For more than 32 months between late 2018 and early 2024, I worked full-time as a freelance iOS developer at Vertica Aarhus. I worked in a team with native iOS development for three of their large clients, with a heavy focus on creating seamless user experiences in both B2B and B2C settings.

    My main responsibilities were:

    • - Participating in the development and maintenance of 2 large scale applications written in SwiftUI.
    • - Building the foundation for a B2C native app in SwiftUI.
    • - Building a complete B2B native app in Swift + UIKit.
    • - Porting a large set of features from an Android application into an existing Swift code base.
    • - Objective-C code base maintenance and feature development.

    Skills: Freelancing · Git · UIKit · CocoaPods · SwiftLint · SwiftUI · XCUITest · Fastlane · XCTest · SPM · XcodeGen · Dependency Injection

    Contact: Mikkel Yde Kjær [ linkedin.com/in/mikkelydekjaer ] - Project manager

  • Mar 2019 - Jul 2019

    OpenTeleHealth (Freelance iOS Developer)

    During a 5-month period, I worked part time with the responsibility of porting an Android application to the iOS platform. The application resides within the remote healthcare domain, and my work was heavily focused around Bluetooth communication with healthcare devices, together with the creation of streamlined build and release processes.

    Skills: Freelancing · Git · Core Bluetooth · iOS · UIKit · CocoaPods · SwiftLint · Swift (Programming Language) · Software Documentation · Fastlane

    Contact: Peter Urbak [ linkedin.com/in/peterurbak ] - Lead developer

  • Nov 2017 - Mar 2018

    Trifork, Aarhus N Dept. (Freelance iOS Developer)

    I worked full-time during a 4.5-month period with native iOS development, where I was part of a seven-member development team. I was responsible for bug fixing, maintenance and development of new features on iOS applications for five clients, including Telenor and Grundfos. I was also responsible for developing a new watchOS application.

    Skills: Moya · VSTS · Freelancing · Git · watchOS · iOS · UIKit · CocoaPods · Realm · Swift (Programming Language) · Auth0 · Objective-C

    Contact: Claus Nyhus Christensen [ linkedin.com/in/clausnyhus ] - Team manager

  • Apr 2014 - Nov 2017

    Bagvendt (Business Partner / Self-employed)

    For a 3.5-year period, I was a business partner and software developer in a small consultancy company in Aarhus. During this time, I developed a strong understanding of working with clients in relation to expectations, needs and problem solving. I primarily worked with developing native iOS applications. Some of the applications can still be found in the App Store by searching for “AVK Toolbox”, “DNU Byggepladsen” and “Blinfo”. I also built a variety of complex WordPress solutions.

    Skills: JavaScript · Prototyping · WordPress Development · Git · UIKit · Ideation · iBeacons · Swift (Programming Language) · SASS

    Contact: David M. Andersen [ linkedin.com/in/davidfromdenmark ] - Former business partner

  • Feb 2013 - Dec 2013

    IT Minds (Consultant & Product Developer)

    During my time as a consultant at IT Minds, I primarily worked with concept development through the design of high- & low fidelity mockups of web and mobile applications. I also worked with front-end development in HTML, JavaScript and CSS.

    Skills: JavaScript · Prototyping · PoC · HTML · CSS · Mockups · jQuery

    Contact: Jonas Vognsen [ linkedin.com/in/jonas-vognsen-6208b7a ] - Partner & co-founder

Educational background

  • Aug 2012 - Jan 2015

    MSc, ICT Product Development at Aarhus University

    I graduated with an average of 10.5, and was considered one of the top students of my class. The entirety of my master’s degree was based around group work and collaboration in teams, enabling me to perform well in teams with various dynamics.

    For further information regarding courses and skills, please refer to my LinkedIn profile.

  • Aug 2009 - Jul 2012

    BSc, ICT Product Design at Aarhus University

    For further information regarding courses and skills, please refer to my LinkedIn profile.

Skills

  • Top skills

    Swift, SwiftUI, UIKit, iOS, Xcode, XCTest, Android, Kotlin, Jetpack Compose, Android Studio, Dependency Injection, Fastlane, CI/CD, App Store, Git, SPM, UI/UX implementation, Bug fixing, Accessibility (a11y), Figma.

  • Intermediate skills

    API design, UI design, Mockups, Prototyping, Ideation, Concept development, WordPress.

  • Soft skills

    When fulfilling the role as a developer, I consider myself to be above average with regards to the following soft skills:

    Independent, Teamwork, Problem solving, Presentation, Employee training, Delegation, Conflict management, Meeting management, Honesty, Work-life-balance, Planning, Time-management, Empathy, Desire to learn, Client management.

Thank you for reading my resume. If I have caught your attention in any way, I will be more than happy to elaborate and clarify in person. Please feel free to reach out.

Kind regards, Stephan Sloth

This resume was printed from abstraktion.dk. If you have any further questions, please contact me at +45 27290644