Be where they are. Discuss with them. Exchange code with them. When you find the best, the ones you're interested in hiring, ask them to come work for you. I've

Be where they are. Discuss with them. Exchange code with them. When you find the best, the ones you're interested in hiring, ask them to come work for you. I've hired a dozen excellent people to my department in the past couple of years. Only half of them have applied on their own without any prior interaction.