Programming
Languages

• Javascript / Typescript
• Elixir

For customer projects, I've focused on "Full Stack JavaScript" development over the last five years and will continue on that path. To enjoy a few hobby projects, I explore Elixir.

Frameworks

• Nest, Hapi, Fastify, Express, Phoenix
• React, Next.js, Polymer, Vue.js
• React Native, Expo
• Electron

Even though I think that an experienced developer can use any framework after a short time, these are my favorites.

Databases

Depending on the application, I prefer to use one or multiple of these.

• MongoDB
• PostgreSQL
• Redis
• LokiJS

DevOps

• Google Cloud Platform, DigitalOcean
• Kubernetes, Docker
• Openshift, Rancher
• Jenkins, Travis, Gitlab CI

No, I'm not a DevOps guy. But after having done a lot of rapid prototyping and working for startups, there is no way around some knowledge.