My portfolio

I’ve worked across a range of industries from aviation to real estate.
Some of my work isn’t public, but here is a selection of projects I can talk about.

Clue

Menstrual health app

Clue is a leading femtech app with over 12 million users around the world. I helped their iOS team improve the app’s architecture while building major new features – most notably Clue Birth Control, an FDA-cleared digital contraceptive.

Highlights:

  • Massive global userbase (localized for 15 languages)
  • Reactive, testable MVVM+C architecture
  • Automated signing & distribution process
iOS / watchOS Swift Objective-C Kotlin

Donut

Investment app

I helped Donut build their iOS app from scratch, all the way until App Store launch. Our tight-knit team was able to iterate quickly based on user research, while keeping the solid foundation that users expect from a financial app.

Highlights:

  • Banking integration
  • Composite animations
  • Rich, flexible design system
React Native GraphQL TypeScript

Jumu weltweit

Youth music contest hub

I built a web application and mobile apps for “Jugend musiziert” contests in 16 countries to replace heaps of paper forms and printed schedules, and help young people connect across borders through music.

Highlights:

  • Fully open-source
  • Drag-and-drop scheduler
  • Dynamic PDF generation
  • Handling of complex domain model
Phoenix GraphQL React Native

FriendHood

Urban activity app

Available on iOS and Android, FriendHood allowed people in Berlin to organize activities together. As their CTO, I planned the tech architecture, wrote most of the app and server-side code, and participated in the UX and visual design process.

Highlights:

  • Polished app UI & UX
  • Design informed by rapid prototyping
  • Cross-platform codebase
  • Real-time chat powered by GraphQL
React Native GraphQL Phoenix