Number of cores used during automated builds

I’m trying to create an automated build for our project. At the moment I’m waiting (a few hours) at the creation page, where the burton turned from “Create” to “Creating…”.

My problem is that the project is quite heavy to build (it is compiling quite some C++ code). To speed it up, we usually compile on multiple cores, e.g. make -j8.
Is it possible to have the automatic builds also working on multiple cores?