need programming help - Details (German):
https://www.ebay-kleinanzeigen.de/s-anzeige/suche-programmier-hilfe-openhab-homeassistant/1612566421-226-5655
I doubt you will find anyone if you require them to have all that knowledge in “OH and HA” as it’s hard enough to keep track on either of these.
So I suggest you make this two strictly separated jobs showing what’s the OH and what’s the HA part about.
I moved your post to a more appropriate category (although @Kai I think we should add a ‘commercial’ category or similar for stuff like this).
its possible to split it in several parts - depending on existing knowledge - OH and HA is running parallel with same Bindings/Integrations as far as existing