We Built a RAG-Powered AI Question Engine Into a JavaScript Interview Platform - Here's Exactly How It Works

This is what happens when you stop treating an interview prep platform like a CRUD app. Someone writes questions. Someone formats them. They get pasted into a database. Users read them. That's it. That's the entire "AI" story at most platforms - a ChatGPT wrapper that answers whatever you type, with zero context about what you've already practiced, zero awareness of duplicate content, and zero intelligence about what question should exist next. JSPrep Pro went a different direction. We built an actual AI pipeline - one that generates questions using RAG (Retrieval-Augmented Generation), checks for semantic duplicates using embedding-based cosine similarity, runs on an automated weekly cron, and feeds into a manual QA + approval workflow before anything touches the question bank. This article provides a comprehensive technical breakdown. If you're a developer who wants to understand how these systems work - and wants to try a JavaScript interview prep platform that's actually intelligen