# Andres Felipe Angel Imbacuan

- **Event:** [Meta Global AI Developer Hackathon](https://cerebralvalley.ai/e/meta-ai-developer-hackathon)
- **When:** Oct 26, 12:00 PM – Nov 4, 9:00 PM (EST)
- **Where:** Online
- **Team:** [Andres Felipe Angel Imbacuan](https://cerebralvalley.ai/u/srfilif)
- **GitHub:** https://github.com/Srfilif/lex-agent
- **Demo video:** https://youtu.be/vXmC1PiLrqQ
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/3286

LexAgent is a conversational legal assistant for Colombian law, focused on state contracting (Ley 80/1993, Ley 1150/2007), the Constitution, and SECOP
  public-procurement data. It solves a concrete problem: legal research in Colombia is slow, fragmented across official sites, and generic chatbots invent articles, laws,
  and citations when answering.

  LexAgent combines multi-turn chat with a hybrid RAG pipeline (Spanish full-text search + vector search + RRF fusion + deterministic rerank) over a curated corpus, so
  every factual claim carries a verifiable citation to the exact fragment (law > article > numeral). An agentic loop with function calling (buscar_normas,
  consultar_contratos) retrieves norms and real SECOP contracts before answering; guardrails enforce abstention when evidence is insufficient (0 obeyed injections and 5/5
  effective abstentions on our 30-question eval), and responses stream over SSE. It also supports projects with per-project file uploads, conversation memory, cost
  tracking per answer, and auth with TOTP.

  Stack: NestJS + TypeScript API, React + Vite web, PostgreSQL + pgvector, Redis, Meta Model API (Muse Spark) for reasoning, and a dedicated embedding provider. Evaluated
  on 30 legal questions: 0 invented citations, 100% recall@8, 86.7% verified-or-partial support.

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- [Kuanysh Salyk](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/3289)

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