Design an audit log for a regulated bank: every admin action recorded, and nobody, including your own team, can quietly rewrite it.

Never-delete is a policy, not a control. Auditors and attackers both want to know what stops an admin with broad credentials, and the answer has to be mechanical.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

Never-delete is a policy, not a control. Auditors and attackers both want to know what stops an admin with broad credentials, and the answer has to be mechanical.

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UP NEXT ON YOUR JOURNEY

Next in this trackUsers upload photos and videos from phones on unreliable networks. Design the path from camera roll to CDN.Next in this trackSearch results lag the database by minutes and it costs money. Design the sync, and plan for the day you must rebuild the whole index.Next in this trackField agents use your app all day in basements with no signal. Design sync so their offline edits merge safely when they reconnect.

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