I manage testing in projects - over the last year 15 distinct projects of various sizes[1].
Customer/publicfacing websites are small part of it, it’s mostly internal business solutions.
One major project was about building a new web platform with few integrations.
Another project was about moving 100+ named applications including numerous integrations.
In both cases the people doing the testing is already domain experts. Which is a benefit, but also require coaching wrt. test case tools, learning to test (besides confirmation) and having to fit test work with their “regular” non-project work.