Most people have a rough idea of what a staffing agency does. It connects companies that need people with people who need work. What stays fuzzy is the part that actually matters: who pays, how the money moves, and what happens behind the scenes between the moment a role opens and the day someone starts. That gap is where the frustration lives, both for hiring managers who suspect they are overpaying and for candidates who wonder why the agency gets a cut at all.
So this is a plain explanation of how a staffing agency works, without the sales gloss. At CRB Workforce we place IT and marketing professionals in permanent, contract, and contract-to-hire roles, and the more clearly both sides understand the mechanics, the better the placements turn out. Here is what is really going on.
What a Staffing Agency Actually Does
Strip away the branding and the model is simple. A staffing agency is a third party that finds, screens, and places workers on behalf of employers filling open positions. A staffing agency finds, screens, and places workers on behalf of employers looking to fill open positions, acting as an intermediary between businesses that need talent and candidates with the right skills. Instead of running the search internally, a company hands the sourcing, screening, and administrative work to a firm that does it full time.
The key thing to understand is that a real staffing agency does the vetting, not just the forwarding. Some agencies conduct thorough, multi-stage assessments, while others simply forward resumes with minimal screening, essentially outsourcing the vetting back to you. That difference is the entire value of the model. A firm that pre-screens saves your team weeks of work. One that spray-forwards resumes just adds a layer of noise. When you evaluate a partner, ask them to describe their screening process in detail. The answer tells you which kind you are dealing with.
Who Pays, and How the Money Moves
This is the part that trips people up, so let me be direct. The employer pays the fee. Always. A legitimate staffing agency never charges the job candidate for placement services, and if an agency asks a candidate for payment, that is a red flag. If you are a job seeker and someone wants money to place you, walk away.
How the fee is structured depends on the type of placement:
- Permanent placement. The agency charges a one-time fee based on the hire's first-year salary. Direct hire fees for IT positions typically range from 15% to 30% of the candidate's first-year salary, with mid-level roles averaging around 20% and senior positions reaching 25% to 33%. The candidate keeps their full salary. The fee is on top, paid by the employer.
- Contract and contract-to-hire. Here the agency works on a markup. The bill rate is what the client pays the agency for a contractor's time, the pay rate is what the contractor actually receives, and the difference covers the agency's costs and margin. For IT contractors, most agencies apply a markup of 35% to 50% on contractor hourly rates, covering payroll taxes, workers' comp, benefits, recruiting costs, and the agency's profit, which usually runs between 3% and 8%.
That last number surprises people. The markup is not pure profit. For a W2 contractor, the spread covers employer FICA, workers' comp, benefits burden, and operational costs before any margin is left. The agency also carries real financial risk in between. Agencies pay workers weekly but may not receive client payment for 30 to 60 days, so they absorb the working capital cost. If you want the full breakdown of contract classifications, our guide on W2 vs corp-to-corp vs 1099 covers it in depth.
What Happens Behind the Scenes
The process is more involved than "post a job, forward a resume." It starts with the intake. The agency works closely with the employer to understand the role requirements, workplace culture, timeline, and expectations before sourcing begins. A good recruiter pushes on the vague parts of a job description, because a fuzzy brief produces fuzzy candidates.
From there the agency taps its network. This is the real advantage of a specialized firm. A specialized IT staffing agency can tap into networks of software developers proficient in specific frameworks, cloud platforms, or emerging fields like AI and ML engineering. These are often passive candidates who are not scrolling job boards. They will take a call from a recruiter they trust, though, which is how you reach people your own job posting never will.
Then comes screening, submittal, interview coordination, offer negotiation, and onboarding paperwork. For contract placements, the agency often becomes the employer of record, handling payroll, taxes, and benefits for the duration. That is why the model exists. It absorbs administrative and compliance load that would otherwise land on your team.
What the Market Is Showing Right Now
The demand behind staffing agencies is measurable right now. Robert Half's 2026 Demand for Skilled Talent report shows 78% of technology leaders plan to increase permanent headcount in the second half of 2026, up sharply from 61% earlier in the year, while 66% expect to add contract professionals. That pressure is driven by shortages: 71% of tech leaders report project delays over the past year due to hard-to-fill skills, with AI integration the most affected at 64%.
How to Get the Most Out of the Model
For hiring managers, the play is to treat the agency as a partner, not a vendor. Share the honest version of the role, the budget, and the stakes. The more context CRB Workforce has, the sharper the shortlist. Decide up front which model fits: permanent recruiting for core roles you expect to keep, or contract consulting when you need specialized skills for a defined window.
For job seekers, be specific about what you want. Salary floor, location, the kind of work that keeps you engaged. A recruiter who knows your real targets can put you in front of hiring managers you would never reach on your own, and the agency's fee costs you nothing. The trade is straightforward. You give clear information, they give access.
Understanding how a staffing agency works removes the mystery from both sides of the table. The employer pays, the agency vets and absorbs the load, and everyone benefits when the match is right. If you want to see how CRB Workforce runs this in practice, whether you are hiring or looking, get in touch and we will walk you through it.