What's normally done here is that companies hire recruiters to fill a spot. And then those (British, always British agencies) go to LinkedIn and shotgun spam every breathing human being with tech in their resume. And cold call. I've started to not answer and then later block british numbers calling me, but a few minutes later they will just call through a local proxy in Norway. Just as much spam as microsoft-spam-calls from Asia. And if you end up talking with them it's just a waste of time. They won't name the company, the benefits, and can't even answer basic questions about the position. Their only value is to get the open position in front of more eyes, but that value is dubious given that I will never have anything to do with a company hiring these spammers.
Honestly, if you're a tech company you should do your own hiring as the candidates will be your most valuable resources. Outsourcing your moat is bad business.