Legal · RAG System

Case Law Research Assistant for Mid-Market Law Firm

Hybrid RAG with citations: research time per matter from 4–6 hours down to ~45–90 minutes.

Research time per matter

4-6 hours

~45-90 minutes

Hours saved (annualized)

~2,000-3,000 at firm size

Citation traceability

Manual notes

Source-attributed, verifiable

The Problem

Associates were spending 4-6 hours per matter researching relevant case law, precedents, and contract clauses across a large internal archive.

The Solution

A RAG system with hybrid search (vector + BM25), cross-encoder re-ranking, and source attribution, returning top precedents with citations in minutes, not hours.

What we would do differently

Version the citation index from the first ingest. Re-indexing after a source update broke links in saved research memos and cost a weekend.

Business Impact

Associates reclaim research hours for strategy and drafting. Payback is usually measured in months once matter volume is stable.

On-premise RAG for legal & regulated data

Tech Stack

Xenith RAG patterntext-embedding-3-smallPostgres + pgvectorBGE-RerankerNext.js

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