Well, you can! Matt Cutts, Adam Lasnik, John Mueller and many more Google Engineers check this forum:
http://moderator.appspot.com/#16/e=c9
Ask a Google engineer
This is your chance to interview us! Feel free to ask anything from “How many cafeterias are there?” to “How would you sort 1 million 32-bit integers in 2MB of RAM?”
This is the link I went to first: