Nexus Shield

Hybrid AI Security Gateway & Governance Middleware

Overview

A hybrid AI security gateway and governance middleware. Nexus Shield sits in front of downstream AI services and masks PII in real time (via Presidio) before requests reach the model — keeping sensitive data out of prompts while preserving utility.

Quick Start

# 1. Clone
git clone https://github.com/Kimosabey/nexus-shield.git

# 2. Install
npm install

# 3. Run
npm run dev

Key Features

• PII masking — detects and redacts sensitive entities before any model call (Presidio).
• Governance middleware — a NestJS gateway fronting downstream AI/LLM services.
• Hybrid architecture — local policy/redaction with cloud reasoning offload.
• Hybrid compute — application logic runs locally; heavy AI reasoning is offloaded to the cloud.

Architecture

See ARCHITECTURE.md for the detailed design.

Documentation

• Architecture Guide
• Failure Scenarios
• Getting Started
• Interview Q&A

Author

Harshan Aiyappa Fullstack Software Engineer — AI & R&D Voice AI · Distributed Systems · Infrastructure