Lilly Tech Systems
Build an AI Content Moderator
Build a complete AI-powered content moderation system that analyzes text and images for policy violations. Detect toxicity, NSFW content, PII, and custom rule violations with configurable policies, human review queues, and webhook integrations — all in 5 hands-on steps.
What You Will Build
A production-ready content moderation platform that automatically screens text and images, applies configurable policies, queues borderline content for human review, and sends webhook notifications.
Text Moderation
Detect toxicity, hate speech, PII, and custom banned content using OpenAI Moderation API and custom rules.
Image Moderation
NSFW detection, violence screening, and OCR-based text-in-image analysis using CLIP and Vision models.
Policy Engine
Configurable rules with severity scoring, category-based thresholds, and automatic action mapping.
Human Review
Queue flagged content for reviewer dashboard with approve/reject workflow and appeals handling.
Tech Stack
Built with production-grade tools. Total cost: $0 for development, under $10/month in production.
Python 3.11+
Core language for the moderation API, policy engine, and review queue backend.
FastAPI
Async web framework for the REST API, webhook endpoints, and reviewer dashboard.
OpenAI Moderation
Pre-trained toxicity and category detection with the free Moderation API endpoint.
CLIP
OpenAI CLIP model for image classification, NSFW detection, and visual content analysis.
Build Steps
Follow these lessons in order. Each builds on the previous one.
1. Project Setup
Set up FastAPI, OpenAI, CLIP dependencies and create the project structure for content moderation.
2. Text Moderation
Build toxicity detection, PII filtering, and custom word/pattern rules for text content.
3. Image Moderation
Implement NSFW detection, violence screening, and OCR-based text extraction from images.
4. Policy Engine
Create configurable rules with severity scoring, category thresholds, and automatic actions.
5. Human Review Queue
Build a reviewer dashboard with flagged content queue, approve/reject, and appeals workflow.
6. API & Webhooks
REST API endpoints, webhook notifications, rate limiting, and authentication for production use.
7. Enhancements
Multi-language support, video moderation, analytics dashboards, and FAQ.