Design a policy builder UI for non-developer security admins

Interview framing: A policy builder is a high-risk UI: it must be understandable for admins and precise enough to avoid accidental over-permissioning.

Design approach:

1. Model the policy clearly:

• Subject: who gets access.
• Action: what they can do.
• Resource: what they act on.
• Context: when or under what conditions.
• Effect: allow, deny, mask, filter, or require approval depending on product model.

2. UX structure:

• Use a guided flow or composable rule blocks instead of a blank expression editor.
• Provide plain-language summaries like "Finance analysts can view invoices in EMEA during business hours."
• Show examples and inline help for domain terms.

3. Validation:

• Validate required fields, invalid combinations, unreachable conditions, and overly broad rules.
• Warn before wildcard-like access such as all users or all resources.

4. Preview and simulation:

• Let admins test sample users/resources before publishing.
• Explain why a decision was allowed or denied.
• Show conflicts and policy precedence clearly.

5. Draft and publishing flow:

• Autosave drafts.
• Require review/approval for risky changes.
• Keep version history and audit logs.

6. Accessibility and reliability:

• Ensure keyboard operation for rule blocks.
• Avoid color-only status indicators.
• Preserve unsaved changes across navigation.

Strong closing: "The most important feature is confidence: admins should understand exactly what the policy will do before it affects production access."