While doing research in the internet I got in contact with an interesting website called competition online. This site offers a big pool of architectural and urban development tenders, mainly focussed on the German market. By registering on the site the user gets the opportunity to participate in the tender process, getting current tender alerts or even posting own tenders to the platform. Users can also contact companies directly by using the competition online's database and finding suitable architects or building contractors. Job advertisements are also avaible. Additionally they offer a collection of books, which could be of interest to you.