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One line of code caused AT&T to lose $60 million
(engineercodex.substack.com)
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this post was submitted on 14 Nov 2023
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Programming
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Hahahaha, you're kidding right? I shit you not, I've literally seen a single line change almost cost a company £150MM during testing because "we need to test in prod because the guy we need to run the test hasn't got access to the QA environment"
Best part was the actual change, there was a bug where a number that should've been divided by 100 was being multiplied by 100, the dev somehow managed to implement the fix in such a way that the number was multiplied by a further 100.
Knight Capital Group lost $440 million in just 45 minutes due to a repurposed feature flag.
https://www.henricodolfing.com/2019/06/project-failure-case-study-knight-capital.html?m=1
Kinda makes the att one seem tiny in comparison.