Projects
Things I’ve built over 20+ years. Apps used by millions, and the projects I’m building 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. 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.
My Projects
What I’m building now.
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
Tandler
A Tandler (Viennese for a second-hand dealer) for everything that can go. You take the photos, it takes care of the rest. Still in stealth. Under the hood, it’s where I’m building long-running, durable background agents: Temporal workflows, my own agent loop, sub-agents, human approvals, and timers.
Stack: Bun, Hono, PostgreSQL, React 19, Temporal, AI SDK, Claude
Forge
Open-source agent skills for structured development with pluggable issue tracking. One workflow from idea to merged code, and the one I use to build everything above. I wrote about it in Forging a Workflow and Reforging the Workflow.
Stack: Agent skills, Claude Code plugin, GitHub
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
- Bookkeepr (2022): Technical consulting via FH Kärnten
- CHOYCE (2023): Technical consulting via build! Gruenderzentrum Kaernten