Marketing freelancers here focus on product and developer marketing: positioning, launch content, social and community work, and the content strategy that sits behind it.
Marketing is the easiest freelance category to buy badly, because activity is easy to produce and results are slow to appear. Protect yourself by agreeing what you will look at in ninety days before anyone starts posting.
Be honest about your starting point. A specialist can do far more with an accurate picture of what has already been tried and failed than with a clean-slate brief that hides it.
A short checklist that makes the quotes you receive comparable and the work easier to run.
How soon should I expect results? Paid channels give signal within weeks; content, community and search work in months. Any freelancer promising fast organic results is selling something you should not buy.
Should I hire a generalist or a specialist? Early on, a generalist who can run several channels is usually better value. Specialise once you know which channel actually works for you.
Can a freelancer work with our existing agency? Often, yes — but agree in advance who owns which decisions, or you will pay twice for the same argument.
Post the project and let matching freelancers come to you, or approach someone from the list above directly.