In my experience, it can be useful to include a request for (straightforward) additional information to be included with an application. I use a fizzbuzz style

In my experience, it can be useful to include a request for (straightforward) additional information to be included with an application. I use a fizzbuzz style question that can be described in a couple sentences and solved by a competent programming in under 5 minutes. Anyone who doesn't include at least an attempt at an answer can be auto-screened. That usually cuts out the majority of applicants, since most are just shotgunning every available job.