Project Overview
Nexa AI: Transforming Legal Rental Assistance with Intelligent RAG Technology
Beyond Himalaya Tech successfully developed and deployed Nexa AI, an intelligent legal assistant that revolutionizes how tenants, landlords, and property managers access information about residential tenancy law in the Australian Capital Territory (ACT). Built on cutting-edge Retrieval-Augmented Generation (RAG) technology, Nexa AI provides instant, accurate, and cited responses to complex legal questions based on the official ACT Residential Tenancies Act 1997.
Real Estate Customer Enquiry - Problem Statement.
Tenants, landlords, and property managers in the Australia face significant challenges. Some of the challenges are listed below:
Time-Consuming Research
Finding specific information in the 200+ page Residential Tenancies Act required extensive manual searching.
High Consultation Costs
Legal advice for routine tenancy questions was expensive and often unnecessary.
Outdated Information
Static resources couldn’t keep pace with legislative updates.
Inconsistent Information
Different sources provided conflicting interpretations of legal requirements.
Accessibility Barriers
Complex legal language made the Act difficult for non-lawyers to understand.
One Smart Platform for Every Legal Stakeholder - Now for Real estate.
Nexa AI serves as a comprehensive legal assistant platform designed specifically for the Australian Capital Territory residential tenancy ecosystem, providing tailored experiences for each user type while maintaining a unified knowledge base grounded in ACT legislation.
Backend Infrastructure
The backend was built with FastAPI in Python, ensuring high-performance API development and seamless scalability. The AI engine leveraged LlamaIndex integrated with OpenAI’s GPT-4, enabling intelligent document understanding and contextual reasoning. A PostgreSQL database enhanced with the pgvector extension powered semantic search, using OpenAI’s text-embedding-3-large model for precise data representation. To further improve accuracy, Cohere’s reranking API refined search relevance. Secure user authentication and management were handled through Supabase, maintaining both reliability and compliance.
Technical Architecture
Beyond Himalaya Tech designed and implemented a sophisticated AI-powered legal assistant using state-of-the-art technologies.
Frontend Infrastructure
The frontend was developed using React 18 with TypeScript, providing a robust and type-safe environment for building scalable interfaces. The design combined Radix UI components with Tailwind CSS, resulting in a clean, accessible, and modern user experience. React Query managed data fetching and synchronization efficiently, while Supabase Auth supported seamless authentication, including social logins. The application was deployed on AWS App Runner, ensuring reliable performance and effortless scalability in production.
Key Features That Power Nexa AI
Nexa AI combines intelligent document processing, advanced RAG-powered retrieval, and a seamless multi-user experience, all built on enterprise-grade security. It delivers accurate legal guidance, role-specific insights, and real-time responses, ensuring scalable, secure, and user-friendly access for tenants, landlords, and property managers.
Intelligent Document Processing
Nexa AI automates the parsing of the ACT Residential Tenancies Act 1997, transforming dense legal text into searchable, structured data. Through semantic chunking of 900-character segments and hierarchical section mapping, the system ensures precise legal citations. Enriched metadata improves discoverability, while ACT-specific terminology and context understanding enable highly accurate, localized legal insights.
Advanced RAG Implementation
The platform employs a robust Retrieval-Augmented Generation (RAG) pipeline that combines vector similarity search with intelligent reranking. Using pgvector, Nexa AI retrieves the top 12 relevant sections before Cohere’s reranking identifies the best five matches. A custom citation synthesizer ensures every answer includes accurate legal references, while context-aware generation keeps responses relevant and compliant.
Enterprise-Grade Security & Compliance
Security and compliance are central to Nexa AI’s architecture. The platform features authenticated user sessions, secure APIs, and adherence to GDPR and the Australian Privacy Act. With audit logging, role-based access controls, and strict privacy measures, every interaction remains safe, transparent, and accountable.
Multi-User Experience Excellence
Built to serve tenants, landlords, and property managers, Nexa AI offers a unified platform with role-based interfaces for personalized experiences. Users benefit from real-time chat, persistent history, and smart suggestions tailored to ACT law. The mobile-first design ensures accessibility from any device, while dark and light themes enhance usability and comfort.
Tech Stack
Tools We Used
AI Engine
LlamaIndex + OpenAI GPT-4
Backend
FastAPI, Python, PostgreSQL with pgvector, Supabase
Deployment
AWS App Runner for seamless cloud scalability
Frontend
React 18, Tailwind, Supabase Auth