You could also go to the People subject and filter on people who are looking for a job at the "looking for" section within the community. As not everyone will read the forum! Look at the attachtment below:
Hope this will help you find mendix developers!
Are you looking for employees? If so, you could do it like Viet suggested.
Are you looking for professional service? You could contact a company from the partner page https://developer.mendixcloud.com/link/partneroverview
For example, us :-)