In 2005, when I was working for Cybertrust, my job title was Security Engineer. Then I left that job, and Australia, to go work for Google as a Linux Systems Administrator.
10 years later, after a fabulous 13 month break, I return to Google as a Security Engineer once more.
I honestly didn't expect it would be possible to return to Google under the same conditions that I had before I left, so I had very low expectations. I have to say that I am extremely humbled by the level of support I have received, both from my peers and my management, to come back.
I also had to make a difficult decision (aided by a coin toss) over whether to return to Google or accept an offer from a local company that would have been a good opportunity to make a broad impact.