One address, and a short note about what this site is and is not, so you know what you are writing into.
Write to me
georg@georgsinger.com — that is the whole contact mechanism. No form, no scheduler, no list to join. Mail reaches a person, and the reply is written by one.
What gets a real answer
If you are building the same kind of thing and got stuck where I got stuck, say where. Those are the messages I answer properly, because they are the ones I would have wanted an answer to. Sometimes they turn into a post — never with your name or your company in it.
Corrections too. If a number here is wrong, or a conclusion does not follow from the evidence I published under it, that is worth more to me than agreement. The whole point of putting the logs on the internet is that someone can check them.
What this site is not
It is a personal working log, written in my own time, about systems I built for myself and run on my own hardware. Nothing on it is for sale. No services are offered here, there is nothing to book, and no part of it is a proposal. If you came looking for a supplier, this is honestly the wrong address and I would rather say so on the page than in a reply three days later.
The products the log describes — emailmanager.ai, seitenhebel.de, swiftrun.ai — have their own sites and their own terms. They are written about here as things I built, which is a different thing from being sold here.
Elsewhere
The build gets posted as it happens on X: @georg_singer. Professional profile on LinkedIn. Quantum computing and AI go to realquantum.ai.