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At JUST EAT, we haven't had an embarrassing performance regression that we haven't noticed and put right on the same day we deployed it - for over two years now. We also haven't been taken down by unexpected load.
We have around 150 engineers deploying tens of times a week across around 120 different components in production. In 2014, we pushed more than 800 discrete changes and coped with around 50% more traffic as we grew. Our uptime has… gone up.
We don't have engineers run a performance test before we release have engineers run capacity tests every month or so when we remember to Instead, we do something a bit different...