The presentation was minimal, included some code snippets and was super easy to follow. Appears that it was put together all in Markdown, using a very popular open source tool (which I was not aware of): sli.dev. Highly recommend it for folks who make technical presentations.
p.s in the same space, someone also recommended https://revealjs.com/
I use Pandoc to Beamer for pretty much every presentation for the last several years. https://github.com/mikerenfro/structured-presentation/ has some scaffolding around that (GitHub action, Makefile, separated settings, etc).