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This is a medium difficulty Software Engineering Fundamentals question, commonly asked during Take-home Project rounds at Amazon.

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This question is commonly asked for Software Engineer candidates at Amazon during technical interviews.

Implement Review Content Moderation | Amazon Interview Question

Q: Implement Review Content Moderation

This question evaluates backend engineering competencies including content-moderation logic, request handling, stateful user persistence, HTTP status management, and test-aware behavior around prohibited content tracking.

You are given an existing backend service for online reviews. The service already supports adding a review and editing an existing review. Successful review creation currently returns HTTP 201, and successful review editing returns the service's normal success status.

The codebase also contains a content-checking utility that can parse a user comment and detect prohibited or sensitive words. Extend both the add-review and edit-review flows so that moderation is enforced consistently.

Requirements:

When a user adds or edits a review, check the review text using the existing content-checking utility.
If the review contains prohibited content, block the request and return HTTP 403 instead of creating or updating the review.
Each prohibited submission increments the user's violationCount by 1 .
After incrementing the violation count, persist the user record with await user.save() or the equivalent persistence call used by the codebase.
If violationCount becomes greater than 3 , set user.isFlagged = true and persist that change.
If user.isFlagged is already true, the user must remain blocked even when the new review text is clean.
Whenever prohibited words are detected, update the user's stored list of violated content words so that it reflects the detected words expected by the unit tests.
Apply the same moderation behavior to both add-review and edit-review paths.

The unit tests verify status codes, violation count updates, flagged-user behavior, persistence, and the saved prohibited-word list.

Requirements:

When a user adds or edits a review, check the review text using the existing content-checking utility.
If the review contains prohibited content, block the request and return HTTP 403 instead of creating or updating the review.
Each prohibited submission increments the user's violationCount by 1 .
After incrementing the violation count, persist the user record with await user.save() or the equivalent persistence call used by the codebase.
If violationCount becomes greater than 3 , set user.isFlagged = true and persist that change.
If user.isFlagged is already true, the user must remain blocked even when the new review text is clean.
Whenever prohibited words are detected, update the user's stored list of violated content words so that it reflects the detected words expected by the unit tests.
Apply the same moderation behavior to both add-review and edit-review paths.

The unit tests verify status codes, violation count updates, flagged-user behavior, persistence, and the saved prohibited-word list.

Implement Review Content Moderation

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Implement Review Content Moderation

Quick Overview

Solution

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