It's TRUE for all large web tech companies. Everything is launched via A/B tests. Your performance evaluation as an engineer is dictated by how much your teams

It's TRUE for all large web tech companies. Everything is launched via A/B tests. Your performance evaluation as an engineer is dictated by how much your teams goal metrics moved thanks to your changes(impact measured by A/B tests). At any given time, a single engineer might have a couple of A/B tests running. That's the single biggest engineering change I have seen in the last 20 years. A/B tests are now crazy simple to set up; just click a few buttons and decide how much traffic to send. The major con is that it leaves a lot of dead code behind when the best of N A/B test arms are launched; the (N-1) unsuccessful arms stick around as dead code.