I don't want to be Negative Nancy here, but I would urge caution against unsolicited job postings that don't come from some of the larger recruiting firms (like Robert Half, TEKSystems, Vaco or such). I've had horrible luck with CyberCoders, though I have heard other people say they've had luck with them. They've strung me along or ghosted me on all 3 attempts I've had with them. But, in my experience, most of the smaller agencies or independent recruiters are either resume harvesters or just plain scammers and identity thieves.
I'd especially watch out for ones that are posting for Government jobs, and especially more so if they're indicating Clearance requirements. For those, I'd check
ClearanceJobs.com or
USAJobs.gov. Word of warning though: government jobs often pay less than private-sector jobs, though the work is usually a lot better defined and the job security is higher.
My main concern is with how much very private information we're willing to give up to a recruiter. Before sending them anything, check to make sure they're actually legit and not some fly-by-night business. And never pay them for job hunting for you. Legit recruiters make their money from the company that hires you.
It really sucks that this is something you have to watch out for, especially if you're in a position where you're needing to find a job, but scammers have figured out that employment opportunities are a great way to get people to give up all sorts of information. And tech people often have more to steal and are less likely to have their hackles raised over a too-good-to-be-true salary offer.