I work as some kind of "technical tracking implementation consultant" for businesses of all kinds and sizes. I love doing that - even if I am in that space for more than 15 years now. Not much else to tell about me here, I guess. Posting very rarely in english (obviously). Much more (German) stuff can be found on my blog: https://www.markus-baersch.de/blog/

Oh, wait: There is one thing you might want to check out. I wrote an ebook on building custom templates for Google Tag Manager. If this is something relevant for you, take a look at the sample and buy it at https://www.markus-baersch.de/gtm-server-templates-book/