I'm the creator of LocalSend – an open-source, cross-platform file-sharing app with 1M+ monthly active users, and the founder of Notan, Germany’s leading grade tracking app with over 700K monthly users.
I’m passionate about building elegant, fast, and scalable apps — from open-source tools to production-ready consumer platforms.
- 📱 Mobile Apps: Flutter (Dart) — my favorite framework for cross-platform development
- 🧰 Full-Stack Systems: Clean architecture, scalable APIs, secure local-first apps
- 🔒 Privacy-First Tools: Building apps that respect user data (like LocalSend)
- 📈 EdTech & AI: Making learning more structured and motivating with Notan
- Programming Language: Dart, Kotlin, Rust, Java, TypeScript, JavaScript
- Backend Framework: Axum (Rust), Spring (Kotlin)
- Frontend Framework: Vue (TypeScript), React (TypeScript)
- App Framework: Flutter (Dart)
- Database Engine: Sqlite, PostgreSQL, MySQL
For more information, please visit https://tienisto.com