ALL
POSTS
59 posts so far.
March 21, 2026Mobile10 min read
The CodePush Update That Silently Bricked 40,000 React Native Users for 72 Hours
We pushed a JavaScript bundle via CodePush — no app store review, instant delivery, zero validation. By the time Sentry caught it, 40,000 users had a white screen and no clean rollback path existed.
March 14, 2026Mobile9 min read
How a Single Power User's Post Triggered 45,000 DB Queries and Crashed Our Mobile API
A synchronous push notification fanout loop for a user with 45,000 followers exhausted our Flask database connection pool in 90 seconds, failing 62% of mobile requests for 3 hours.