How to source candidates for free

The free channel everyone reaches for first is a job post, and it's the one that pays worst per hour spent. Gem's 2025 recruiting benchmarks report, drawn from 140 million applications and 1.3 million hires between January 2021 and December 2024, found that “job boards and social sites dominate the application pool, accounting for nearly half (49.0%) of all applications” while contributing “less than a quarter (24.6%) of actual hires” (published January 2025). The post costs nothing. Reading four hundred applications costs a week.

Every free channel works like that. The money is free and the attention is not, and the channels charge wildly different amounts of it. An hour asking three colleagues who they would work with again returns four names you can write to today. An hour on a job board returns forty applications, two of which are worth a second read.

The useful question is which free channels produce named, reachable, plausible people per hour. The answer is consistent: the ones where somebody has already done the filtering, whether that's a colleague who worked with the person, an interview loop that said yes to them once, or a community that only admits people who do the work.

1. The people your team already knows. Ask three colleagues who they would work with again, about named companies rather than job titles, and write to the names the same day. The fullest version of the ask is on how to get employee referrals.

2. Finalists you turned down. An interview loop already said yes to them once, and the reason they lost has often changed. The message for this is below.

3. Communities you are already in. Slack groups, meetups, alumni lists and the forums where your candidates argue about their work. Ask a question there before you post a job, and write to the people whose answers you would hire.

4. Published work. GitHub for engineers, a portfolio host for designers, Google Scholar for researchers, conference programs for anyone who speaks. Search where the work is rather than where the resumes are.

5. Email. A free LinkedIn account and a site-restricted Google search find the profile, and most company address patterns are guessable. Write as the person who will manage them, about work you can describe in detail.

Free job boards are the sixth channel, and the Gem numbers above are the warning. Post to two or three and budget the reading time.

Two of those channels come down to one question: who do the people around you already know. Happenstance answers it as a search instead of a survey. Everyone connects the accounts they already use for work, seven sources in all, and their networks become searchable in plain language. Ask “who do we know who has led a data engineering team of five or more?” and the reply is people, ranked by how much evidence there is behind each relationship, alongside the colleague who holds it.

Happenstance is free. The free plan is the whole product, with usage limits on chat and web searches beyond your network. Pro raises the limits: unlimited web searches and results, higher chat limits, and CSV export.A group has no cap on how many people join, which is what makes this usable by a company with no recruiting budget at all. There's a fuller walkthrough on Happenstance for recruiting, and the sibling page on doing this inside LinkedIn is how to source candidates on LinkedIn. The wider idea behind it is relationship mapping.

This is the highest-yield free message there is, and almost nobody sends it. It works because you aren't asking a stranger to consider you, you're telling somebody who already wanted the job that the reason they did not get it has changed.

Note what is missing. No apology for the earlier decision, no flattery, and no pretense that this is a fresh opportunity they have never heard of. The candor is the persuasion.

If they say no, ask one question before you close the thread: who else should you be talking to. A person who nearly took the job knows exactly what the job needs, and that answer is another free channel.