Developers are in such high demand that most will be in constant receipt of recruitment messages, even those open to new opportunities have little incentive to explore job boards like Indeed and Glassdoor relative to other careers. Personally, I am very proactive about exploring opportunities and so job boards are very valuable to me… but as a recruiter, you should assume that the majority of talent will never see your job listing.
The strategy you employ depends very much on the type of business you’re recruiting for. If you’re a consultancy that builds thousands of Wordpress sites each year for SMEs your strategy will be very different to if you’re a VC-funded technology company tackling interesting problems.
If you can describe the type of work your company does it’ll be possible to provide more specific advice, but the generic answer is: pay 50% above market rate, be very relaxed about location (i.e: support remote work) and give your existing employees a $10k bonus for everyone they successfully refer – you’ll fill seats quickly.