My Works

ZigHaven is an upcoming iOS app that serves as a frontend for Zigbee2MQTT.

Features

• Room-based device management with real-time status monitoring and control
• Ability to deploy a Vapor-based server backend for power monitoring of compatible smart plugs on a Linux server via Docker directly from the iOS app
• Devices are grouped by room and room background images are generated through integration with Apple Intelligence
• Full accessibility with VoiceOver support

Technical Implementation

• Developed with Swift and SwiftUI
• Direct data exchange with MQTT broker using the CocoaMQTT framework

Bike and Ride is an iOS app currently in development for managing (cargo) bikes. It provides features such as maintenance management and combined route planning that integrates cargo-bike-optimized train connections with bike navigation.

Features

• Digital management of maintenance and inspection tasks ("service log") for bicycles.
• Route planning that combines bike and train connections, prioritizing cargo-bike-friendly routes.
• Integration of Deutsche Bahn APIs with manual enrichment for real-time queries of train connections as well as elevator and station data.
• Crowd-sourced cargo bike models: a user-maintained database of model information.
• Full accessibility: support for VoiceOver, dynamic type, contrast settings, and more.

Technical Implementation

• Developed with Swift and SwiftUI.
• Backend based on Vapor.

Next Station: Marriage is a website built on Grav CMS with a custom-developed theme and plugins for guest management and photo book integration – created for my own wedding.

Features

• Custom-developed website theme designed to convey a 90s retro feel, fully responsive while maintaining modern UX standards
• A custom plugin enables creating a guest list in the admin area, generating access tokens and QR codes that give guests personalized access to the site. The RSVP and contact forms are pre-filled with guest group names, allowing one-click registration
• Custom photo book plugin automatically organizes uploaded photos by guest group, with an admin dashboard for overview and download management

Technical Implementation

• Two fully custom GravCMS plugins: Guest Token Authentication and Photobook Admin with custom event handler integration
• Automated QR code generation: SVG export with logo integration using the Endroid QrCode Library for print-ready invitations
• Structured data persistence: CSV-based guest and RSVP management with admin dashboard for live overview and export functions

As part of an international, interdisciplinary team, I worked for more than seven years on the continuous development of the customer portal myAudi.com, and at times also on the iOS version of the myAudi app.

Challenges

• Designing and conceptualizing features such as service appointment booking and charging planning for electric vehicles
• Ensuring a consistent user experience across multiple platforms

My Contributions

• Conceptualization and design of user interfaces for features including service appointment booking and EV charging planning
• Planning and conducting usability tests with focus groups to optimize user guidance and functionality
• Coordination within the SAFe framework, including alignment with international teams and stakeholders

These experiences significantly enhanced my skills in UX/UI design, agile methodologies, and cross-cultural collaboration.

The Train Destination Display is a minimalist web application that faithfully emulates the iconic Hamburg U-Bahn destination display (used until 2025) – including its characteristic dot-matrix style and countdown.

Project Context
Originally created as part of my wedding website, it evolved into a standalone project with a focus on visual authenticity and easy customization.

Features

• Emulation of the original dot-matrix display with realistic pixel rendering
• Configurable destination texts, line numbers, and symbols via a simple configuration file
• Flexible layout logic for handling varying text lengths and multiple lines
• Customizable pixel mapping for different display types

Technical Implementation

• Pure JavaScript without frameworks for maximum portability
• Rendering via HTML & CSS using a custom pixel grid
• Modular structure for easy integration into other web projects

Smart Alarm was one of the first alarm clock apps in the Apple App Store, offering innovative features to improve the waking-up process.

Key Features

• Wake-up within a defined interval based on the user’s current sleep phase
• Optional adjustment of wake-up time based on weather conditions, e.g., earlier wake-up in case of frost

Technologies

• Developed in Objective-C with integration into a proprietary cloud system
• Use of sensor and weather data to dynamically adjust wake-up time

Although the app was discontinued due to time constraints, it remains an example of innovative app development in the field of health and well-being.

PT Guide was an iOS app specifically designed for blind and visually impaired users of public transportation.

Features

• Audio guidance for transfers and exits during bus and train rides
• Integration with Apple’s VoiceOver technology for accessible usage

Development

• Designed and implemented as part of my final vocational training project
• Extensive user testing with the target group to optimize navigation and usability

Although the project was later discontinued due to time constraints, it remains a significant contribution to accessible mobility.

In 2005, I founded the website simple-dev.org as a platform for self-developed mobile and web apps as well as German localizations of third-party apps.

Highlights

• Providing resources and tools for the developer community
• Offering localizations to support German-speaking users

After 20 years, I decided to close the website in 2025 due to time constraints.

PresActive is a web-based presentation app controlled entirely through touchless gestures.

Project Context

• Created as part of my final university projects
• Exploration of the impact of touchless gestures on design, functionality, and user acceptance

Technologies

• Developed with HTML, JavaScript, and jQuery for the web platform
• Implementation of gesture recognition for controlling presentations

The project demonstrates innovative approaches to human-computer interaction.

ExtruFace was a collaborative project between university and industry, focused on developing a gesture-controlled user interface for extrusion industrial machines.

Project Goals

• Development of a prototype for intuitive machine control through gestures
• Alignment with typical workflows to improve usability

My Role

• Participation in all project phases, from requirements analysis to implementation and final approval

The project demonstrates the application of modern UX/UI principles in industrial contexts.

For the online magazine ApfelBlatt, I developed the official iOS app with separate design concepts for smartphone and tablet.

Project Scope

• Complete conception and implementation of the app
• Ongoing client consultation and integration of reader feedback to optimize the user experience

The app provided readers with an optimized mobile platform for accessing the magazine’s content.