Freelance Developer based in Munich, Germany. Building AI prototypes and automations with LLMs, n8n, and Node.js. Open source enthusiast. Two projects funded by the German Federal Ministry of Education and Research (BMBF).
25+ years at the intersection of language and technology — from Voice Interfaces and Alexa to Large Language Models and AI Automation. 40+ published Alexa Skills, including enterprise work with Alexa Smart Properties.
Today I work agent-first: AI coding agents (Claude Code) are part of my daily development workflow — not an experiment on the side.
Open to selected freelance work around LLMs, Voice and AI automation.
→ LinkedIn · Blog · Homepage · YouTube · APL Ninja
| Project | Description | Links |
|---|---|---|
| Wunderprompt | AI-curated news — less noise, more signal. Built with n8n, LLMs and Node.js. | wunderprompt.com |
| Private Prompts | Privacy-first AI usage. Desktop app for local data masking. Funded by BMBF. Featured in DLF, PC Welt, golem.de, SZ. | privateprompts.org · GitHub |
| Voice-QL | Explore databases by voice — accessible, no SQL needed. Funded by BMBF. | GitHub |
| Meine Mediathek | Browse media libraries from public TV stations via voice. | meinemediathek.de |
| Skill | Description | Store |
|---|---|---|
| Schlauberger | Natural language interface for GPT on Alexa | 🇩🇪 |
| Mein Dashboard | Widget-style dashboard for Echo Show devices | 🇩🇪 🇺🇸 🇬🇧 |
| ToolBox | Command line interface for Alexa Skill developers | 🇩🇪 🇺🇸 🇬🇧 |
| Universallexikon | Context-aware Wikipedia skill with intelligent keyword matching | 🇩🇪 🇺🇸 🇬🇧 |
| Kurznachricht | Voice-to-email: speak a message, get it as email | 🇩🇪 |
| Commander Speedo | Voice-controlled shoot-em-up arcade game on Echo Show | 🇩🇪 🇺🇸 🇬🇧 |
| APL Doctor | Device-specific viewport diagnostics for APL developers | 🇩🇪 🇺🇸 🇬🇧 |
| Cinema Space | Browse and watch NASA video archive by voice | 🇺🇸 🇬🇧 |
| R2D2 | Astromech translator for fun | 🇩🇪 🇺🇸 🇬🇧 |
→ Full list of all published Alexa Skills on amazon.de
| Tool | Description | Links |
|---|---|---|
| Voice Model Expression Language | Expression language for compact Alexa voice model notation | Web App · LinkedIn Article |
| Magic Prototyper | Jovo V4 build hook for rapid voice app prototyping | GitHub |
| Magic Model | Jovo V4 build hook — Spintax & Jexl support for voice models | GitHub |
| Model Linter | Jovo V4 build hook — linting for voice model files | GitHub |
| Spintax Plugin | Jovo V4 output plugin for natural-sounding dialogue variation | npm · GitHub |
| Jexl Plugin | Jovo V4 output plugin for expression language in responses | npm · GitHub |
| APL Grid Generator | Generate APL container grid layouts | Web App |
| JSON Formatter | Online JSON pretty printer | Web App |
| Spintax Exploder | Expand Spintax expressions to all permutations | Web App |
| Publication | Topic | Link |
|---|---|---|
| Süddeutsche Zeitung | Private Prompts — Datenschutz bei KI-Nutzung | Artikel |
| PC Welt | Private Prompts: Nutzen Sie KI-Tools ohne Preisgabe Ihrer Daten | Artikel |
| PC Welt | Private Daten vor KI-Nutzung schützen – so geht's | Artikel |
| golem.de | Datenschutz vs. KI: Private Prompts schützt vertrauliche Daten | Artikel |
| Zahnärztliche Mitteilungen (zm) | Private Prompts | PDF (S. 73) |
| Arbeitsgemeinschaft Diabetologie Baden-Württemberg e.V. (ADBW) | So schützen Sie persönliche Daten bei der Erstellung von Prompts | Artikel |
| s3nnet.de | About: Private Prompts | Artikel |
| Smarthome Assistant | Widget-Alternative für Echo Show: Alexa Skill "Mein Dashboard" | Artikel |
| Podcast | Language | Topic | Links |
|---|---|---|---|
| DLF "KI Verstehen" | 🇩🇪 | Warum man ChatGPT nicht alles erzählen sollte | Episode · Transkription |
| t3n MeisterPrompter | 🇩🇪 | Penibler Datenschutz — Private Prompts vorgestellt (DMEXCO 2025) | Episode |
| Public Interest Podcast (Prototype Fund) | 🇩🇪 | Freiberuflichkeit und Open-Source-Entwicklung | Episode · Transkription |
| beyond touch (Voice Tech Talk) | 🇩🇪 | Voice, Alexa, APL, Multimodalität und APL Ninja | Website · Transkription |
| Between Two Beans | 🇺🇸 | Alexa Skills und Developer Spotlight | Episode · Transkription |
- 🏛️ Civic Coding ‒ Innovationsnetz KI für das GemeinwohlPrivate Prompts 2.0 (2025/2026)
- 🏛️ BMBF / Prototype Fund — Private Prompts (2024–2025)
- 🏛️ BMBF / Prototype Fund — Voice-QL (2022–2023)
- 🥈 2nd Place — Telekom Hackathon "Remote Rhapsody" with "Virtual Help Desk" (2020)
- 👑 👑 Jovo Community Member of the Month (×2)
- 📝 Contributor to APL Ninja — Alexa Presentation Language resources
AI & LLMs
Automation
Voice & Multimodal
Code & Frameworks
Principles
Cloud, Tools & Environment
