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Releaser didn’t support the level of granularity, so I knew I was going to have to do some pretty invasive changes to the Releaser code base. The two systems couldn’t support this change. Two components existed at Twitter at the time that I built Decider, those being Releaser, which allowed you to do fractional releases of things, and Darkmode, which turns things “on” and “off”. We wanted to make native retweets to fix this and to do that, for reasons beyond the scope of this interview, we needed to roll it out extraordinarily gradually, to ten thousandths of the user base at a time. I could retweet Barack Obama and make him say something awful that he would never say, like, “Emacs is far inferior to Vim,” or something like that, that clearly Barack Obama would not get into. There were a lot of problems, for one, you could lie. I needed to build it to ship native retweet, for which I was the tech lead.Īt the time, people were doing retweets on Twitter, but it was always “RT space whoever’s name, and then the text of the tweet. “Feature flagging” was about the first thing I worked on when I started at Twitter in 2009. Earlier this year Matt shared some of his unique viewpoints and stories about feature flagging/toggling with me for the Toggle Talk series.

All of which led to him moving back to NYC where he learned Rails at scale and helped build Twitter’s Decider tool. Matt Knox has had quite the eclectic career from growing up on a dairy farm, practicing musical theater, studying physics at NYU, running biology labs, and even having done his own startup.
