There's an interesting "reverse job board" for Rails devs -> https://railsdevs.com/ that sounds pretty close to what you're looking for. I'm not sure what stack you work with but it might be of interest.
Since I launched in November I’ve placed 10+ Rails developers with gigs. About half for full-time roles with salaries ranging from $100k to $200k.
For context, cold messages on LinkedIn have a 5-20% response rate. Usually on the lower end.
railsdevs is currently sitting at 50%+. If you’re hiring a Rails developer everyone is already half qualified - so matching is much more likely.
How well does it work for rail Devs?