Most people are already employed. Some of them will move if your place looks likely to be an improvement. Limiting your search to the currently available will c

Most people are already employed. Some of them will move if your place looks likely to be an improvement. Limiting your search to the currently available will cut the pool drastically. It's really easy to write a job listing that will be ignored. It'll still get lots of noise but not so much signal. It's probably also important where you post it, especially if your website doesn't pull a lot of traffic to the careers page by itself.