it's developed by @heinz_gies from Project FiFo, they may pay him to do changes on it, but it wasn't started there and AFAIK heinz doesn't work there full time.
Mariano is correct, DalmatinerDB is build and maintained by Project-FiFo. Dataloop (the authors of the blog post) is currently the biggest user (as far as I know at least), using it in their SaaS.
They have however been excellent open source citizens and contributed back improvements, bug reports and suggestions.
They have however been excellent open source citizens and contributed back improvements, bug reports and suggestions.