Our engineers work a shifted day that gives four to six hours of overlap with US and European working hours, and that overlap is protected, not best-effort, stand-ups, reviews and anything needing a conversation happen inside it. What changes is that you stop expecting an instant answer at any hour, which most teams adapt to within a fortnight and some find improves how they write things down. If your work requires eight hours of overlap, say so early; there are arrangements that get closer, and they cost more, and we would rather price it than have you discover the constraint in month two.