I'm a senior Flutter freelancer based near Stuttgart, Germany. I build production-grade mobile and desktop apps for B2B, industrial, and consumer clients across the DACH region — often with BLE hardware integration, native-to-Flutter migrations, or multi-flavor CI/CD.
- Exposure — creator app co-developed with Vertical Meters. 90k+ lines of Flutter, custom layout engine (RepaintBoundary-optimized), OpenAI integration. Live on iOS and Android → exposure-app.com
- Industrial Flutter projects — mobile and tablet apps with BLE gateways for industrial automation and engineering (under NDA)
- Primary: Flutter, Dart, BLoC/RxDart, Drift, flutter_blue_plus (BLE), Firebase
- Native: Kotlin/Jetpack Compose (Android), Swift (iOS) — where Flutter hits its limits
- CI/CD: GitHub Actions, Fastlane, Codemagic — multi-flavor builds, automated store deployments
- Also in the toolbox: Vue.js, Electron (for engineering-tool projects)
- BLE and hardware-paired apps
- Native → Flutter migrations
- Custom rendering and performance-critical mobile UIs
- Multi-tenant apps with automated CI/CD across many build flavors
Data-Driven Approaches to Micromobility Demand Modeling · Röhner, Ravlija, Trautwein, Sonntag · 2026 Peer-reviewed chapter in Computation and Communication for Smart Systems Symposium (C2S3 2025), Springer Cham. DOI: 10.1007/978-3-032-10569-1_3 · Code (institutional repo)
Real-Time Suggestions for Optimizing Fleet Distribution of Sharing Services · M.Sc. Thesis, Hochschule Esslingen, 2025 A hierarchical reinforcement learning framework for dynamic fleet rebalancing in shared-micromobility services, decomposing the problem into a strategic operator-level controller and local user-incentive agents. Thesis · Code framework
- 🌍 Remote from Stuttgart
- 🔗 roehnersoftware.com · Projects
- ✉️ contact@roehnersoftware.com
Most of my client work is under NDA and lives in private repos. Pinned repos below are the public fraction.