AgentShield is a full-stack AI security platform built end-to-end. • Frontend: React, dynamic dark UI, and real-time graph visualization. • Backend: Node.js, Express.js, and secure REST API architecture. • Auth & Data: Email/OAuth (GitHub/Google) with optimized MongoDB schemas. • Core: Custom O(M) Trie-based scanning algorithm for threat detection. This production-grade project demonstrates an advanced MERN stack, secure user flows, clean modular components, and live data visualization ready for enterprise deployment.