I know Apple has some engineers that work in other offices - there’s a good component in Cork (Ireland) in Software Engineering, and other offices where engineers work out of.

Similarly, I know of a fair number of engineers at Facebook working or who have worked out of their London office.

The big tech companies definitely prefer to centralize engineering though, simply because video conferencing software is not there yet, and in-person communication is still far superior to the remote communication tools we have today.

I say this as someone who works at one of the companies mentioned above.