The key word is "meaningful" and that's going to vary depending on the employee's interests. I transferred a few times at Google. When I looked at internal job

The key word is "meaningful" and that's going to vary depending on the employee's interests. I transferred a few times at Google. When I looked at internal job listings, there were lots of jobs that I didn't want to do. I suspect that many good jobs went to people who learned about them in some way other than official job postings. (This is generally true.)