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mediumJPMorganAmazonCapital One

How do you roll back a bad model in production?

Reported from JPMorgan's MLE loop, and graded on one distinction most candidates miss: rollback is a capability you build before the incident, not an action you improvise during it. The pointer-flip mechanics, the auto-trigger debate, and when rollback itself is unsafe.

Updated Sep 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

Reported from JPMorgan's MLE loop, and graded on one distinction most candidates miss: rollback is a capability you build before the incident, not an action you improvise during it. The pointer-flip mechanics, the auto-trigger debate, and when rollback itself is unsafe.

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