That was standard practice in startups, but the network was now big and important enough that unreliability threatened to stunt its growth and scare off clients, Henke thought. The weekly downtime, which included an office happy hour to lubricate a long night’s work, stemmed from LinkedIn’s scrappily built technology. Clicking on a profile would summon the “ wizard of ,” a jaunty, staff-wielding mascot akin to Twitter’s famous “ fail whale.” Recruiters paying to trawl the website for candidates were forced to twiddle their thumbs. The fast-growing professional social network had about 50 million users, but every Thursday afternoon it went completely offline as engineers launched new features and fixed bugs. “What the heck is wrong with all of you?” was the sanitized gist of it. In 2009, LinkedIn’s new engineering chief, David Henke, assembled his full crew of coders and managers for the first time and fired off tough questions.
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