HOW WE PREPARE SHOPIFY FOR BFCM (2025)

Summary from the TLDR Dev newsletter

Shopify prepared for Black Friday Cyber Monday (BFCM) from March to October by running bimonthly "fire drills" that simulated 150% of the previous year's peak traffic, conducting chaos engineering exercises called "Game Days," and systematically identifying and fixing infrastructure bottlenecks. Its preparation included capacity planning across multiple cloud regions, load testing with its tool, "Genghis," and creating a "Resiliency Matrix" to document vulnerabilities and response procedures.