Working with these kind of number of users is kind of insane. Not exactly 3B but during my first quarter at FB I broke some obscure flow for uploading photos th

Working with these kind of number of users is kind of insane. Not exactly 3B but during my first quarter at FB I broke some obscure flow for uploading photos that people going to the website using phones that opt out of the mobile site might end up in. I would've never figured out that I needed to test it. And within the hour it affected 25 million people!