DField SolutionsMérnöki stúdió · Budapest
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Internal RAG knowledge base for a Hungarian law firm · on-prem, 200+ lawyers, 0 data incidents

An internal RAG for a Hungarian law firm · 40k legal documents indexed, 200+ lawyers using daily, strict per-user access controls, zero data incidents.

Timeline10 weeks
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Reviewed by
0140,000 documents indexed, 200+ lawyers using daily.
02 / Average junior-lawyer research time on a case-58%.
03Zero data incidents in 8 months.
04 / Partner time saved on knowledge transfer~15h/week across the firm.
The problem01 / 03
  • 01Partner knowledge was trapped in people's heads · years-long tenure, slow transfer.
  • 02Legal privilege + client confidentiality couldn't tolerate a generic LLM.
  • 03Per-case access control · junior lawyers shouldn't see senior-only documents.
  • 04Magyar legal terminology (with archaic phrasing) isn't a default LLM strength.
The solution02 / 03
  • 01Claude Opus with strict refusal behaviour on out-of-scope queries.
  • 02Per-case RBAC enforced at retrieval layer · pgvector index segmented + RLS.
  • 03Custom Hungarian legal-terminology embedding fine-tune (LoRA on a 1B base).
  • 04On-prem deployment · no document leaves the firm's VPC.
  • 05Citation-mandatory output format · every answer links back to source documents.
The outcome03 / 03
  • 0140,000 documents indexed, 200+ lawyers using daily.
  • 02Average junior-lawyer research time on a case: -58%.
  • 03Zero data incidents in 8 months.
  • 04Partner time saved on knowledge transfer: ~15h/week across the firm.
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