Profile examples of the kind of people you are looking for. Or talk to the client about the sort of people they need. Use this to formulate a benchmark for the wanted mindset of the future co-worker.
Based on the benchmark, write advertising that precisely reflects the wanted mindset. This looks and sounds attractive to the people you want. People who like the advertising have the right mindset.
Once candidates call, you have a precise, real life standard to compare them to: the benchmark. You can quickly see to what extent they fit and even what kind of training they would need.