Do you use agile or waterfall? What documentation is kept?
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1Note that the answer to this question has drastically changed since the answers to this question were posted. You can find current information at Which tools and technologies are used to build the Stack Exchange Network?Sonic the Anonymous Hedgehog– Sonic the Anonymous Hedgehog2019-06-14 20:26:09 +00:00Commented Jun 14, 2019 at 20:26
2 Answers

(source: stackoverflow.com)
And if you’re wondering what our software engineering process looks like from here on the inside, this video reveals all.
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The linked video is not available any more, just checked :-) I'm located in germany, but it doesn't look like a geolocation block.huch– huch2020-05-07 12:17:13 +00:00Commented May 7, 2020 at 12:17
Stack Overflow was built by a small team of very experienced (and committed) developers; therefore it is likely that no formal development methodology was needed.
From the outside it looks like they used:
Keep saying No to every “feature request”, until they can no longer think of a reason to say No.
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if everyone works like 'that', methdology will soon be in the books only.abel– abel2010-10-06 09:11:51 +00:00Commented Oct 6, 2010 at 9:11