Senior iOS / Flutter Developer

3/2020 – 1/2021

Durstexpress is striving to become Germany’s leading last-mile beverage delivery service. I joined the iOS team in the early stages of their consumer app development and contributed across all phases, from initial development through to release.

The app is built on a VIP architecture, with modularization of shared components into reusable frameworks. The project embraced advanced agile practices, including pre- and post-mortems, retrospectives, weekly backlog grooming, and technical planning sessions.

Scrum, Git, iOS, iOS Entwicklung, Softwareentwicklung (allg.), Swift (Programmiersprache)

9/2019 – 12/2019

The SalonLab Smart Analyzer is the first device that enables hairdressers to scan their clients’ hair structure using near-infrared technology. It connects via Bluetooth to an iPad app that visualizes both the scanning process and the results in real time.
My role was to support the iOS team in completing the app on schedule. This involved rapidly adapting the existing architecture and infrastructure to implement new features, reviewing merge requests, and optimizing the overall performance of the application.

Scrum, Git, Application Development, iOS, Swift (Programmiersprache)

7/2019 – 8/2019

Led the architecture and CI infrastructure development for a large-scale banking application, designed to support both traditional banking features—such as account management and transactions—and act as a digital currency wallet.

The architecture followed an MVVM pattern, incorporating functional reactive programming, a declarative router for view controller presentation, and a Redux-style state management system. The app also implemented advanced encryption for securing credentials and user data.

My responsibilities included designing and documenting the architecture, setting up the continuous integration and delivery pipeline, and ensuring scalability and maintainability across the entire codebase.

Scrum, Git, Application Development, iOS, Swift (Programmiersprache)

5/2019 – 7/2019

Performed stability and performance improvements for a legacy application, focusing on compatibility with the latest iOS version. This involved in-depth analysis of logs and crash reports to identify critical issues, along with extensive use of profiling tools to detect and resolve memory leaks and threading bugs.

Scrum, Git, Application Development, iOS, Objective-C

12/2018 – 2/2019

Developed multiple new features for a road-based recommendation app, with a focus on implementing a map view that uses clustering to efficiently display large datasets. Also integrated community features within the user profile to enhance engagement and personalization.

Scrum, Git, Application Development, iOS, Swift (Programmiersprache)

6/2018 – 10/2018

Led development of two augmented reality applications utilizing ARKit 2 for 3D object detection of physical exhibits.

The first app is a white-label tool designed for scanning real-world objects, as well as managing, exporting, and testing completed scans. The second, branded application imports these scans to recognize physical objects and overlay corresponding 3D models in augmented reality.

Key challenges included achieving realistic rendering of the AMG motor and enhancing user experience by minimizing ARKit-related glitches and improving session stability.

iOS, Swift (Programmiersprache)

5/2017 – 6/2018

Led the development of a new iOS application for Daimler AG, providing users with direct access to company news, media assets, personalized product presentations, and drive events.

As technical lead of the mobile team, I was responsible for ensuring the app met Daimler’s strict compliance standards regarding legal and security requirements. The architecture was built using a functional-reactive Redux approach within an MVVM structure, featuring a declarative routing engine for navigation and deep link handling. To safeguard against misuse, the app employed advanced obfuscation and encryption techniques.

The project followed an agile Scrum workflow using Jira and Git Flow. The definition of done included automated tests, peer-reviewed pull requests, and comprehensive QA processes.

Scrum, Git, iOS, Swift (Programmiersprache)

2/2017 – 5/2017

Lead development of a mobility prototype for iPhone and Apple Watch.

Scrum, Git, iOS, Swift (Programmiersprache)

10/2016 – 2/2017

Led development of the What Drops Now iPhone and iPad app, a curated lifestyle shopping platform built in Swift, similar in concept to Canopy.

The app was developed using the PureMVC framework, with continuous integration set up via Travis CI and UI testing implemented using Google’s Earl Grey.

Scrum, Git, iOS, Swift (Programmiersprache)

5/2016 – 9/2016

Developed a shopping app in Swift with Instagram-like features, including a content stream, camera integration, and user profiles.

The architecture was based on MVVM with data binding and the Coordinator pattern to manage navigation. Continuous integration was implemented using Travis CI, and UI testing was handled with Google’s Earl Grey.

Scrum, Git, iOS, Swift (Programmiersprache)

3/2016 – 6/2016

Led development of a music streaming app in Swift, similar to Spotify, with a strong focus on offline caching and seamless playback using AVFoundation to ensure a smooth and uninterrupted listening experience.

Scrum, Git, iOS, Swift (Programmiersprache)

10/2015 – 1/2016

Developed new MapKit-based features and improved the architecture of a carsharing app, enhancing both functionality and maintainability.

Actively applied agile practices such as pair programming, timeboxing, Scrum, and rigorous code reviews to ensure high-quality, collaborative development.

Scrum, Git, iOS, Objective-C

2/2015 – 4/2015

Led development of an interactive macOS app for a smart mirror, controlled via Bluetooth toothbrush and face tracking.
The app was showcased at Mobile World Congress 2015 and featured in Wired.co.uk.

Scrum, Git, iOS, Objective-C

7/2014 – 10/2014

Elitesingles.co.uk

Led development of the multilingual iPhone dating app for elitesingles.co.uk and eDarling.de.
Focused on designing a flexible, skinnable architecture that supports multiple languages and branding, enabling the app to be easily adapted for different styles and markets across various countries.

Scrum, Git, Objective-C, iOS

11/2013 – 4/2014

Vitra Workbays

Led development of a Cocos3D/UIKit-based iPad app delivering a detailed real-time 3D experience of the new micro-architectural office system, “Workbays.”
The app features 24 configurable POD models that users can rotate, zoom, and customize.

Git, iOS, Objective-C, Scrum

11/2013 – 3/2014

Forms & Elements

Led development of a multilingual, WordPress-based architecture magazine app for iOS and Android.
Focused on creating a comprehensive environment that enables the client to easily produce, distribute, and share the magazine across iOS, Android, and the web.

Android, Git, iOS, Objective-C, Scrum