Learn · Track 5

When it breaks

Why did it work yesterday?

Your app broke and you have no idea why. It left you a note.
Sep 26, 2026
Your app is fast for you and slow for everyone else — the reason is geography
Sep 26, 2026
You fixed the typo. Visitors still see the old version. Here's why.
Sep 26, 2026
Don't make the user wait for the slow part — hand it to a queue
Sep 26, 2026
It worked with ten users. Then a hundred showed up at once.
Sep 26, 2026
One script, 10,000 fake signups overnight: the guardrail most vibe-coded apps ship without
Sep 26, 2026