My Works

Onoma is an iOS app available on the App Store for couples to find baby names together.

UX/UI Design

• Card-based swipe interface with gesture navigation optimized for one-handed use
• Smart pairing mode finding compatible first/middle name combinations with visual compatibility scoring
• Visual feedback for offline mode with pending action indicators that sync when online
• Comprehensive filter system: gender, popularity, length, starting letters, historical era
• Private web links for friends and family to contribute name suggestions
• Auto-advance mode for hands-free browsing

Technical Implementation

• Built with Swift and SwiftUI
• Custom-developed AuthenticationKit framework for user authentication with email/password, Apple Sign In, and Passkeys
• Vapor for backend with custom API
• Offline-first architecture with pending swipe queue and automatic sync
• Real-time data synchronization across multiple devices
• Network monitoring with server reachability validation
• AI-powered semantic search with natural language queries
• Custom phonetic analysis algorithm for name compatibility
• StoreKit integration for premium name packages

Challenges

• Creating shared decision-making that works both synchronously and asynchronously
• Balancing detailed name information with quick gesture-based decisions
• Clear visual states for offline, pending sync, and real-time collaboration
• Switching between first and middle name modes

ZigHaven is an iOS app available on the App Store serving as a frontend for Zigbee2MQTT smart home systems.

UX/UI Design

• Room-based device organization with card-based display
• Real-time device status monitoring and control
• Device scheduling with weekly schedule editor
• Vacation mode with temperature strategies and scheduling
• Power consumption visualization with charts
• AI-generated room background images using Apple Intelligence
• AI-powered contact sensor type detection
• Full VoiceOver accessibility support

Technical Implementation

• Built with Swift and SwiftUI
• MQTT integration using CocoaMQTT framework
• SwiftData for local device and room persistence
• Multi-device configuration sync over MQTT
• Server deployment wizard for Vapor-based power monitoring backend on Linux via Docker
• SSH integration for remote server management
• Network connectivity monitoring and validation
• Power consumption API with caching

Challenges

• Managing MQTT connection reliability across network transitions
• Synchronizing device state across multiple iOS devices via MQTT
• Deploying and configuring Linux backend from iOS interface
• Real-time device control with proper state reconciliation
• Balancing local caching with real-time updates

Next Station: Wedding is a website built on Grav CMS with custom theme and plugins for guest management and photo book integration.

UX/UI Design

• 90s retro aesthetic with modern UX standards
• Fully responsive design across devices
• Token-based personalized guest access with pre-filled forms
• Photo book interface organized by guest groups

Technical Implementation

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

Challenges

• Balancing retro aesthetics with modern usability expectations
• Creating secure yet frictionless guest authentication
• Managing photo uploads and organization across multiple guest groups
• Generating print-ready QR codes for physical invitations

myAudi is Audi's customer portal at myAudi.com. I worked on its continuous development in an international, interdisciplinary team for over seven years, including the iOS app.

UX/UI Design

• Service appointment booking system design
• EV charging planning interface
• Multi-platform consistency across web and iOS
• Usability testing with focus groups

Project Contributions

• Feature conceptualization and UI design for service booking and EV charging planning
• Planning and conducting usability tests to optimize user guidance
• Coordination within SAFe framework with international teams
• Cross-platform design system maintenance

Challenges

• Ensuring consistent user experience across multiple platforms
• Balancing feature richness with interface simplicity
• Coordinating design decisions across international stakeholder groups
• Adapting agile processes for large-scale enterprise development

Train Destination Display is a web application emulating the iconic Hamburg U-Bahn destination display (used until 2025) with its characteristic dot-matrix style and countdown.

UX/UI Design

• Faithful recreation of original dot-matrix display aesthetics
• Configurable layout logic for varying text lengths
• Responsive design maintaining authentic pixel rendering

Technical Implementation

• Built with vanilla JavaScript for maximum portability
• Custom pixel grid rendering via HTML & CSS
• Flexible configuration system via simple config file
• Modular structure for easy integration

Challenges

• Achieving visual authenticity while maintaining web compatibility
• Creating flexible layout system for multiple line configurations
• Balancing historical accuracy with modern customization needs

Originally created for a wedding website, evolved into a standalone project.

Smart Alarm was one of the first alarm clock apps in the Apple App Store with innovative features for improving the wake-up process.

UX/UI Design

• Smart wake-up timing within user-defined intervals
• Weather-based wake-up adjustments for user convenience
• Sleep phase-aware interaction design

Technical Implementation

• Built with Objective-C
• Integration with proprietary cloud system
• Sensor data processing for sleep phase detection
• Weather API integration for dynamic wake-up adjustments

Challenges

• Balancing alarm reliability with sleep phase flexibility
• Integrating multiple data sources (sensors, weather) for wake-up decisions
• Creating intuitive controls for complex timing logic

The app was discontinued in 2017 due to time constraints.

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

UX/UI Design

• Audio-first interface for accessible navigation
• VoiceOver-optimized user flows
• Extensive user testing with blind and visually impaired users
• Turn-by-turn audio guidance for transfers and exits

Technical Implementation

• Built with Objective-C
• Deep integration with Apple's VoiceOver technology
• Real-time location tracking for transit navigation
• Audio feedback system for guidance cues

Challenges

• Designing navigation without visual feedback
• Ensuring reliability for safety-critical transit guidance
• Optimizing audio cues for noisy transit environments
• Balancing information density with audio clarity

The app was discontinued in 2015 due to time constraints.

simple.dev was a website platform for self-developed mobile and web apps as well as German localizations of third-party apps.

Project Scope

• Resources and tools for the developer community
• German localizations for international apps
• Platform for distributing personal projects
• 20 years of continuous operation and maintenance

The website was closed in 2025 due to time constraints.

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

UX/UI Design

• Touchless gesture controls for presentation navigation
• Gesture-driven interface design minimizing visual chrome
• User acceptance testing for gesture interaction patterns

Technical Implementation

• Built with HTML, JavaScript, and jQuery
• Gesture recognition system for touchless control
• Web-based platform for cross-device compatibility

Challenges

• Designing intuitive gesture mappings for presentation controls
• Balancing gesture innovation with user acceptance
• Exploring impact of touchless interaction on functionality and design

ExtruFace was a collaborative university-industry project developing a gesture-controlled user interface for extrusion industrial machines.

UX/UI Design

• Gesture-controlled interface aligned with typical machine operator workflows
• Intuitive machine control reducing training time
• Industrial-focused UI design for production environments

Technical Implementation

• Built with HTML and vanilla JavaScript
• Gesture recognition system for touchless control
• Prototype development from requirements analysis to final approval

Challenges

• Adapting modern UX/UI principles to industrial machinery contexts
• Balancing gesture innovation with operator familiarity
• Ensuring reliability in production environments

ApfelBlatt 3.2 was the official iOS app for the online magazine ApfelBlatt.

UX/UI Design

• Separate design concepts optimized for smartphone and tablet
• Magazine-optimized reading experience
• Iterative design refinement based on reader feedback

Technical Implementation

• Built with Objective-C
• Complete conception and implementation
• Ongoing client consultation and integration of user feedback

Challenges

• Creating distinct layouts for different screen sizes while maintaining consistent brand identity
• Optimizing magazine content for mobile consumption