Software. Built with passion.
Fullstack development end to end - web, backend, Android. Five own products running in production.
Own products
From idea to production - everything built and hosted by me.
Live GrowTracker Android App
Native grow management for Android
Native Android app for plant management, tasks, statistics, DLI calculator and BLE sensors - with JWT auth and 2FA.
Live GrowTracker CSC Management
Cannabis Social Club administration
Management system for Cannabis Social Clubs: members, inventory, partner directory, push messages and admin dashboard.
Live GrowTracker Web App
Progressive Web App
Full PWA with plant management, calculators, community forum and synced backend - runs on all devices.
Beta StickGuard
Hardware security system
Hardware security system with web dashboard, desktop agent and policy engine - ECDSA auth, audit logging and live WebSocket updates.
Beta NookDay
Stress-free Android day planner
Modern habit and day planner without streaks or pressure. Habits, appointments and shopping list in one calm Android app.
What I build for you
No agency overhead. Direct, fast, maintainable.
Web Development
Modern sites & apps with Astro, animations and responsive design.
Backend & API
Express, MySQL, auth, CMS and clean REST architecture.
App Development
Android with Kotlin and progressive web apps.
Support & Consulting
Reviews, updates, monitoring and long-term maintenance.
Cyrill Zenkner
Private developer from Germany. I build software I would use myself - from database to UI, everything on my own servers.
Learn more →Ready for your next project?
Send a message - I usually reply within 24 hours.