The Lundy Navigator project is an AI-powered knowledge assistant designed for real estate Multiple Listing Service (MLS) organizations to streamline the retrieval of information from vast internal documentation.

Core Functionality:

The application leverages Retrieval-Augmented Generation (RAG) to provide accurate, cited answers from trusted internal sources. Its primary functions include:

  • Data Ingestion: Supports manual uploads of PDF, HTML, and Text files, as well as an automated, scheduled web crawler to pull content from internal websites.
  • Document Processing: Chunks documents into meaningful paragraphs, prepends contextual location data, and converts them into vector embeddings for storage.4
  • Intelligent Retrieval: Performs vector searches to provide direct answers to user queries, complete with links to the exact document sections used as sources.
  • Multimodal Interaction: Includes support for voice-to-text queries and audible voice output for hands-free use.
  • User Management: Features a multi-tiered dashboard (Admin, Editor, Reader) with role-based access control.
  • Asynchronous Scaling: A scalable system (v3) uses asynchronous job queues to handle large files and high-volume processing simultaneously.

Technical Stack

The project utilizes a robust modern technology stack:

  • Backend: Python Django and Django REST Framework for the core API and application logic.
  • Frontend: Next.js and React for the customer-facing dashboard and user interfaces.
  • AI & LLM:
    • Models: GPT-4, GPT-4o, and GPT-4o-mini.
    • Embeddings: OpenAI text-embedding-3 (large and small).
    • OCR: PaddleOCR for multilingual text extraction.
  • Data Storage:
    • Relational: PostgreSQL.
    • NoSQL: MongoDB.
    • Vector Database: pgvector within Postgres.
  • Infrastructure (AWS):
    • Compute: Lambda and EC2
    • Storage: S3 for document and artifact storage.
    • Messaging: SQS, Redis, and Celery for task queuing and event handling.
    • Monitoring: CloudWatch for logging.
  • Security: Keycloak (OIDC) for authentication and Role-Based Access Control (RBAC), PropelAuth for session management, and encryption at rest
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