I'm Karl, Karl Marx (not a joke), a backend developer from São Paulo, Brazil. My main work now is related to NodeJS, majorly with web-based services, but I really enjoy C++ and topics related to infrastructure.
If you want to see my for fun projects check out the repositories. I have a website too: karls.dev (Portuguese), with a much more professional introduction (but with some easter eggs, the console works on desktop, try roll command).
My blog: Holistic Investigations
Linkedin: Karl Alexander
As my colleagues say a lot of times:
Você só pode estar de brincadeira Karl