Cyrill Zenkner · Private Developer

Software.
Built with Passion.

I build web apps, backend systems and Android apps — privately and with care. Clean, maintainable and for real users.

Stack: Node.js Astro MySQL Express Android TypeScript

growtracker.api.ts

// Fetch plant profile
router.get('/plants/:id',
  auth,
  async (req, res) => 
    const plant = await
      Plant.findById(req.params.id);

    res.json(
      name: plant.name,
      stage: plant.stage,
      dli: calcDLI(plant)
    );
  
);

3+ Years Experience

3 Own Projects

1k+ Active Users

100% Remote

What I offer

Services

I help with personal or external projects — as a private individual, without agency overhead.

Web Development

Modern websites & web apps with Astro, Vanilla JS and REST interfaces.

Backend & API

Node.js, Express, MySQL — with JWT auth, CSRF protection and rate limiting.

App Development

Native Android apps with Kotlin and Progressive Web Apps.

Maintenance & Consulting

Code reviews, updates and long-term support for existing projects.

My work

Portfolio

Projects I built myself and actively maintain.

GrowTracker

Live

Android app & web platform for cannabis grow management. Plant tracking, DLI calculator, BLE sensors and admin panel.

Android Node.js MySQL PWA

Pixel-Play

Live

Gaming platform with game library, progress tracking and personalized recommendations.

Node.js MySQL Vanilla JS

Study-Forge

Beta

Adaptive learning platform with flashcard system and spaced-repetition algorithm.

Astro Node.js MySQL

View all projects →

About me

Hi, I'm Cyrill.

Private software developer from Germany — I build projects I'd want to use myself. Clean, maintainable, no black boxes.

From database to backend to frontend — everything on my own servers, with my own code. No vendor lock-in.

Node.js Express MySQL Astro TypeScript Android Kotlin REST APIs nginx

More about me →

Location

Germany · Remote

Focus

Web · Backend · Mobile

Status

Private individual

Contact

cyrill-pascal.zenkner
@zenkner-technology.de

Software. Built with Passion.