How to lose $172,222 a second for 45 minutes

This is probably the most painful bug report I’ve ever read, describing in glorious technicolor the steps leading to Knight Capital’s $465m trading loss due to a software bug that struck late last year, effectively bankrupting the company. The tale has all the hallmarks of technical debt in a huge, unmaintained, bitrotten codebase

http://pythonsweetness.tumblr.com/post/64740079543/how-to-lose–172–222-a-second-for–45-minutes