Projects
A selection of things I’ve built over 20+ years, from apps used by millions to side projects I’m tinkering with today.
Highlights
iTranslate Converse
Apple Design Award 2018 | watchOS
Part of the team that built iTranslate Converse for watchOS, a real-time conversation translation app that Apple recognized for outstanding design and innovation. One of those rare projects where everything clicked.
MindMeister & MeisterTask
7M+ / 10M+ users | iOS, macOS, watchOS
Shaped the mobile foundation for Meister’s productivity suite from 2010 through today. Built MindMeister’s mobile apps over 11 years, then helped build and shape MeisterTask iOS/watchOS from its 2015 launch. Local-first architecture with fully transparent sync and deep platform integration. For notes, we built a hybrid approach where the native app acted as a BFF for a shared web-based editor across all platforms.
iTranslate Pro
50M+ downloads | iOS, Android, Mac
Mobile architecture for the flagship translation app. Worked across iOS, Android, Mac, and Apple Watch versions during iTranslate’s rapid growth phase (2017-2019).
Bitmovin Player SDK
Used by major streaming platforms | iOS
Kicked off SDK development and designed a hybrid native/web solution for video playback. The SDK powers video for major streaming platforms.
Side Projects
What I’m building in my spare time.
Colorburst
AI-powered coloring book generation. A production SaaS using Gemini 2.5 for the generation pipeline.
Stack: Bun, Hono, PostgreSQL, React 19, Google Gemini
HatchUI
Server-Driven UI component delivery for mobile apps. Exploring how to ship UI changes without app updates using Kotlin Multiplatform.
Stack: Kotlin Multiplatform, SwiftUI, Jetpack Compose, Bun, Hono, PostgreSQL, React 19
Anvil
Agent runtime that turns any CLI into an AI agent. One binary, one YAML config, zero frameworks. Define tools as bash commands, and Anvil handles the LLM calls, tool execution, and safety controls. Everyone should build their own agent loop once.
Stack: Go, LLM integration
Selected Client Work
A few highlights from 23 clients over 20+ years of freelancing through topmind GmbH.
| Project | Client | What I Did |
|---|---|---|
| James | Alturos | White-label tourism eCommerce app for DACH ski destinations. Full stack from concept to delivery. |
| Skiline | Alturos | Complete rewrite of legacy ski tracking app for iOS and Android. |
| StepsApp | StepsApp | Legacy modernization using strangler fig pattern on ancient Objective-C codebase. |
| Authenticator+ | Rocket Apps | End-to-end 2FA and password manager with cross-device sync and encryption. |
| femSense | SteadySense | MedTech fertility tracking app with Bluetooth LE wearable integration. |
| Sommercard | Zell am See-Kaprun | Tourism guest card app across iOS, Android, watchOS, and wearOS with Rails backend. |
| SalesPad | TIME MODE | 22-year client relationship. E-commerce, B2B shop, mobile POS. |
Entrepreneurial Ventures
Mobile Subscription Management Platform
2017-2018
Built a platform for managing mobile app subscriptions across iOS and Android, essentially RevenueCat before RevenueCat existed. Didn’t achieve product-market fit, but RevenueCat later proved the market was real. The deep StoreKit and Google Play Billing expertise from this venture directly led to consulting work.
Startup Mentoring
- NeedNect (2020): Technical consulting via Alpen-Adria-Universitaet Klagenfurt
- CHOYCE (2023): Technical consulting via build! Gruenderzentrum Kaernten