How do you onboard an augmented engineer?
Give them a running environment on day one, a named person who answers within the hour for two weeks, a small real ticket rather than a tutorial, and access to the same documents your own engineers read. Teams that do these four reach full contribution in about four weeks. Teams that do not are still answering setup questions in week three.
Onboarding is the single largest variable in whether augmentation pays back, and almost all of it sits on your side of the table. Here is the fortnight that works.
Before day one. Accounts created and tested, not requested. Repository access, the ticket tracker, the chat workspace, the staging environment and whatever single sign on gate stands in front of them. An engineer who spends their first two days waiting for an account has already cost you a week of the engagement at full rate.
Day one. A written walkthrough of what the product does and who uses it, then the environment running locally. Pair for an hour. Their first task should be a real ticket that is genuinely small, not a contrived exercise, because you both need to see what their work actually looks like in your codebase.
Week one. Daily contact with one named person. Review everything, including the trivial changes, because early review is how you transfer standards rather than discover divergence later. Expect questions, and expect them to be about context rather than code.
Week two. Hand over a feature with a vague edge, and watch how they handle the ambiguity. Do they ask, assume, or build the smallest version and check? That answer tells you more about the engagement's future than any technical interview did.
Day thirty. A deliberate review against the measures below. Thirty days is early enough to change the match without having wasted a quarter, and late enough that the data means something.
One thing we ask clients to do that is easy to skip: write down the decisions nobody wrote down. Why the database is structured that way, which service is being deprecated, which part of the code everyone is scared of. Augmented engineers hit those unwritten rules in week two, and the cost of rediscovering each one is a day.