Projects

Selection of projects and applications I've built.

• 
  SRF News, Meteo & SportSenior iOS Engineer

  Shipping and maintaining three iOS apps (News, Meteo, Sport) with 1M+ daily active users using Swift & SwiftUI. Driving code quality through refactoring and code reviews at scale.

  iosswiftswiftuiapple
• 
  Lichess MobileOpen Source Contributor

  34 merged pull requests — built 3 native iOS widgets from scratch, shipped puzzle features, openings explorer, and in-app log viewer for one of the world's most popular chess apps.

  iosflutterdartopen-sourcelichess
• 
  eCarUpLead iOS Developer

  Led the rewrite of 50k+ LOC from Xamarin to Swift, designed new UI/UX, maintained Angular frontend and .NET backend, managed Azure infrastructure with Kubernetes and ArgoCD. Secured $100k Microsoft for Startups funding.

  iosswiftangulardotnetazurekubernetesdevopsxamarin
• 
  AMBOSSiOS Developer & Backend Owner

  Built and maintained two iOS apps (Knowledge & Qbank) with offline CoreData sync. Created, deployed, and managed a Python backend API end-to-end. Maintained CI/CD pipelines and served as code reviewer.

  iosobjective-ccore-datapythondevops
• 
  DasKochrezeptSolo iOS Developer

  Built the app from scratch — custom UICollectionView layouts, RESTful API integration, cookbook and shopping list features. Featured by Apple, reached

  iosobjective-c
• 
  MyDriver (Sixt)Lead iOS Developer

  Led the iOS team, refactored legacy codebase for customer and driver apps, introduced new design, and maintained Jenkins CI server running the unit test suite.

  iosobjective-c
• 
  igobubbleiOS Developer

  Developed the iOS client in Objective-C/C++ and built the backend API in C# .NET with MSSQL. Worked on all aspects of the app and server in a small cross-functional team.

  iosobjective-c.netcsharp
• 
  TrendULead Mobile Developer

  Led the complete rewrite of the iOS app from a v1 delivered by an external agency. Implemented custom UIKit Dynamics animations and a Tinder-like swiping interface generating 200k decisions per day.

  iosobjective-c
• 
  Tuba.fmSolo iOS Developer

  Built the app up to v2.5 — Core Audio streaming via Audio File Stream Services and Audio Queue Services, user accounts, station customization, and Facebook integration. Winner of Mobile Trends Award 2012.

  iosobjective-ccore-audio
• 
  SpacequestOpen Source Creator

  Built an iOS space shooter game from scratch using Swift and SpriteKit with custom gameplay mechanics, enemy AI, and particle effects.

  iosswiftspritekitgame
• 
  Newton's MelodiesiOS Developer

  Built a music creation app with a custom physics engine from scratch — collision detection and gravity simulation in OpenGLES 1.1 and Objective-C++. No external physics libraries.

  iosobjective-copenglesgame
• 
  Orange WednesdaysSolo iOS Developer

  Built v1 end-to-end — cinema repertoire browsing, trailer playback via MPMoviePlayerController, seat selection, ticket booking, and a "Two for One" promotional campaign feature. Consumed a JSON-RPC API.

  iosobjective-c
• 
  Payback PLiOS Developer

  Ported the German iOS app to work with a Polish content provider — adapted the codebase and API layer, localized the UI. Reached top 50 in the Polish App Store Lifestyle category.

  iosobjective-c
• 
  BBQOpen Source Creator

  Built an open-source iOS app showing public grilling spots in Berlin with MapKit integration and CoreData persistence.

  iosobjective-ccore-datamapkit
• 
  Animation extensionsOpen Source Creator

  Created and published an open-source UIView category library with ready-to-use animations (rotation, flip, shake, pulse) via CocoaPods.

  iosobjective-cuikitcocoapodsanimation
• 
  Sprite AdditionsOpen Source Creator

  Built and published an open-source UIImage category for sprite sheet extraction, simplifying sprite animation workflows in iOS apps.

  iosobjective-canimationsprite