The Arena · Fortune 500 Case Files
Practice QA like a Fortune 500 case file.
🚨 Severity Triage · Easy
Prime Day SEV queue
Five tickets land in the on-call channel five minutes before Prime Day midnight launch. Rank most-severe to least-severe.
+10 XP · ~2 min
Company arc · Amazon
This week at 📦 Amazon
Black Friday
Peak Traffic
Five cases pulled from the SEV-1 queue during a Black Friday weekend.
Legend mode · Real public incidents
History's greatest outages, as case files
2012 · Industry
Knight Capital — $440M in 45 minutes
$440M lost in 45 min · firm bankrupt
2017 · Amazon
AWS S3 us-east-1 — typo took out half the internet
~4 hours down · S3, EC2, console, half the web
2024 · Industry
Crowdstrike — 8.5M Windows machines bricked
~8.5M endpoints down · airlines grounded · hospitals scrambling
2017 · Industry
GitLab — rm -rf'd the production database
6 hours data lost · 5 of 5 backup methods failed
2021 · Industry
Facebook — BGP withdrew the company from the internet
~6 hours · FB / IG / WhatsApp / internal tools offline
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