A long while back I wrote a blog expressing my opinion that Agile is better for security than waterfall. The company LinkedIn gave a good example of that this past week. Per this article about an XSS vulnerability they recently resolved, "Dua alerted the company of the bug shortly after 11 p.m. on Monday, and according to his disclosure timeline, LinkedIn implemented a fix shortly after 2 a.m. on Tuesday.".
Now that's quick turn-around! You aren't able to consistently do that successfully unless you're comfortable with moving fast, coding fast, and testing fast. But if you're good at moving fast like that, I believe your site is going to end up much more secure.
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