Freelancer in Hamburg

Waldemar Kornewald

Hi, I'm Waldemar Kornewald - a freelance software engineer based in Hamburg, Germany. I've been writing software since my early childhood (1996) and constantly improving my skills in designing easy to understand, maintainable code.

I'm available on-site in Hamburg or remote for:

  • Mobile apps: Android, Flutter, Kotlin, Java
  • Frontend: React, TypeScript, JavaScript
  • Backend: Python, Django, Flask
  • DevOps: Kubernetes, Docker, infrastructure-as-code
  • Architecture consulting

If you need help with one of your projects just contact me:


Some of my latest customers/projects:

  • 2017 2020 Ovy: Flutter, Android/Kotlin/Java, Flask/Python, Bluetooth LE (custom thermometer), Dockerized dev env, Google App Engine, Redis
  • 2017 2017 SPIEGEL: Kubernetes setup/ops (on-prem & GKE), how-to-use workshops, Elasticsearch, PostgreSQL, Prometheus, Kibana, Grafana, Docker images for various services, etc.
  • 2014 2020 Locandis: Android/Kotlin/Java, React/TypeScript/JavaScript, Django/Python, Bluetooth LE (iBeacons), PostgreSQL, Redis, Docker
  • 2015 2018 sefibo: React/TypeScript/JavaScript, Django/Python, Elasticsearch, PostgreSQL, Redis, Docker, custom task queue
  • 2014 2015 Mainmetrics: Django/Python/SQLAlchemy, Python/JavaScript frontend, PostgreSQL, Redis, Docker
  • 2008 2014 various customers: Python, JavaScript, Django, Android, Java, Google App Engine, PostgreSQL, MySQL, Elasticsearch, MongoDB, Redis, C++
  • 1999 2008 various open-source/free projects: Python, Django, Trac, C++, Java, GPIB, WinAPI, Perl, PHP, x86 asm, USB HID


Over the past 20 years I've also made several open-source contributions: