What "forward-deployed" actually means
A forward-deployed engineer is not a consultant. The job isn't to draw an architecture diagram and leave. The job is to embed in a customer's codebase, ship the thing that has to ship this quarter, and walk out leaving behind code their engineers will not delete the day you leave.
The hardest part is restraint. You can see the ten things you'd refactor. You ship two of them and write a doc about the other eight. The two you ship are the ones that have to be there for the next FDE to land softly.