Digital patient questionnaire system for medical practices developed during EXXETA LVLX Summercamp. Features end-to-end encrypted patient data collection with dynamic form generation, digital signatures, PDF generation, and secure certificate-based data transmission. The platform includes a Laravel backend API with user authentication and an Angular frontend with responsive form components for medical intake forms, consent forms, and patient history collection. Built as a prototype to modernize paper-based patient intake processes in medical practices. The prototype was deployed on Azure and has been successfully tested in a real-world medical practice setting in Berlin.
Collaborative jukebox for Spotify: guests search and vote, and the top‑voted track is auto‑queued a few seconds before the current one ends. QR codes planted around our flat during parties ended the music DJ duties for good. You don't like this track? Search and vote for the next one!
Android app to use an Android smartphone as an SMS gateway for other web applications. The app polled a backend service for outgoing SMS messages and sent them using the Android SMS API. Incoming SMS messages were forwarded to the backend service as needed. The app was build for an early stage startup with the goal to provide small rented solar systems in Africa (Ghana). After payment the user would receive a SMS with a code to unlock the solar system for a certain time period. The app was deployed in Ghana and was successfully used for a short period of time before the startup pivoted to a different field.
Web-based enterprise application for the meat producing industry (Schlachthof). Based on the same self-developed platform used for the courier logistics application, featuring integration of domain-specific import and export interfaces (e.g. EDIFACT) and generation of domain-specific PDF documents to fulfill regulatory requirements applicable to the meat processing industry in Germany. As of 2025, this application is still in active use.
Web-based enterprise application for courier logistics with carrier interfaces for 'derKurier', FedEx and GLS. Features automatic bookkeeping, invoicing, tax calculations, way bill generation and remote printing. Additional interfaces for payment imports using FinTS and exports to Datev, Stotax, Lexware. Built with self-developed backend framework including custom ORM and user rights management with full separation of frontend SPA and backend.