Hi Koen. I used to have part ownership in a home building company. We hired architects to be sure, but there are a couple of specialties that are similar, I'm talking about someone who does detailed kitchen design. Not just the cabinets and styles, but how a new kitchen might be designed to function better. The architectural plans will just show 'kitchen'. Someone needs to thoughtfully fill that kitchen with the right stuff. I believe there are some kitchen design schools or credential programs you might look for. Bathroom design is another similar one. Landscape design, or urban planning too for that matter. Lots of urban planning (what cities will look like) is archeticgural in nature.
Lots of options Koen. Good luck.