---
title: The most expensive software bug in history...
link: https://www.youtube.com/watch?v=UuqSy1jPSUw
source: youtube-com-fireship
published: 2026-08-27T17:48:13Z
updated: 2026-09-08T15:51:56Z
first_seen: 2026-09-19T21:30:23.395188495Z
authors:
- Fireship
summary: |-
  Get $100 in Hyperagent bonus credits when you sign up for a paid plan - https://www.hyperagent.com/fireship100

  In 2012 Knight Capital lost $440 million dollars because of a rogue feature flag. What did we learn from that mistake? Not much.

  #coding #programming

  Want more Fireship?

  🗞️ Newsletter: https://bytes.dev
  🧠 Courses: https://fireship.dev
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---

Get $100 in Hyperagent bonus credits when you sign up for a paid plan - https://www.hyperagent.com/fireship100

In 2012 Knight Capital lost $440 million dollars because of a rogue feature flag. What did we learn from that mistake? Not much.

#coding #programming

Want more Fireship?

🗞️ Newsletter: https://bytes.dev\
🧠 Courses: https://fireship.dev