When a US company engages an engineer outside the country, there are two very different structures underneath, and they are rarely explained clearly. In one, you contract with the engineer or their business directly. In the other, a vendor sits between you and takes the money in, then pays the engineer out. Both are legitimate. They are not the same deal, and the difference is worth understanding before you sign anything.
The two structures, plainly
In a direct engagement, you sign a services agreement with the engineer or with the company they operate through. You pay them. Whoever introduced you charges you separately for the introduction and the assessment work. In an intermediary structure, the vendor contracts with you, contracts separately with the engineer, and the engineer's compensation is inside the vendor's rate. You never see the two numbers separately, because the gap between them is the vendor's business model.
What that gap costs you over a long engagement
A one-off introduction fee is a known quantity. You pay it, it ends, and the ongoing cost of the engineer is whatever you and the engineer agreed. A margin inside an hourly rate is not a known quantity, because it recurs on every hour for as long as the engagement lasts. On a multi-year relationship the difference between those two shapes is substantial, and it compounds silently, because the invoice looks the same every month.
It also decides who holds the relationship
In a direct structure, the engineer works for you and knows it. You can renegotiate scope with them, move them to a different project, extend or end the arrangement, and talk about money without a third party in the room. When the vendor is the counterparty, every one of those conversations routes through someone whose interest in the outcome is not the same as yours. That is fine when you want an arms-length arrangement. It is friction when you want an engineer who acts like part of the team.
The paperwork question that scares people, and its actual size
The usual objection to a direct structure is that it sounds like a compliance problem. In practice, for an engineer working entirely outside the United States through their own registered business, the documentation involved is a foreign-status form your finance team collects once and files. Your own counsel and accountant should confirm the specifics for your situation, because facts differ and this is not advice. But the reason so many companies believe the direct route is exotic is usually that the person explaining it to them earns their living from the other one.
What to ask before you sign either one
Ask who the engineer's counterparty is. Ask whether the fee is one-time or recurring, and if recurring, what it is a percentage of. Ask what happens to the relationship if you stop working with the vendor. Ask whether you are permitted to contract the engineer directly later, and on what terms. The answers are not always in your favour, and that can still be the right deal. What is not acceptable is not being told.
Where we sit, so you know our bias
We introduce engineers and we are not in the payment path. Our clients contract with and pay the engineer or the engineer's business directly, and we invoice separately for the sourcing, assessment and introduction work. That is a deliberate choice and it has a consequence worth stating: our income does not grow with the length of your engagement, so we have no reason to keep ourselves in the middle of it.
If you want the structure walked through against your own situation, that is a normal conversation and it costs nothing. Start a conversation.