CS & Econ @ NYU. I build grounded, auditable AI systems: retrieval and LLM tooling that cites its sources, refuses when it can't, and gates on evals.

The thread across my work is evidence over guesswork. Answers trace to a source or never get made, extraction ties every claim to where it came from, and LLM behavior is tested in CI like any other code.

Website · LinkedIn · ValtricAI · rajahh7865@gmail.com

A RAG system that turns a multi-day FDA research task into cited answers in minutes. Built during my 2026 internship for a generic-drug Clinical Regulatory Affairs team. Private repo. Read the case study

• Citation-or-refuse by design: every answer carries a source and page or an explicit "not found," enforced as tested invariants, not prompt guidelines
• Synthesizes six FDA sources (Orange Book, Drugs@FDA, DailyMed, Shortages, REMS, Product-Specific Guidances), resolving the product before retrieval so a citation can never cross drugs
• Graded in CI against a gold set with hard gates on recall@k, citation precision, and refusal accuracy before any merge
• Python, FastAPI, ChromaDB/pgvector, SQLModel, Dagster, Next.js/TypeScript

A low-latency Go service that fuses vector and keyword retrieval with SSE streaming. Repo

• Hybrid retrieval (pgvector cosine + tsvector) fused via Reciprocal Rank Fusion, hitting 100% recall@5 on a 24-query suite
• Go API on Chi with goroutine fan-out, a two-level LRU cache, and per-IP rate limiting for concurrent queries
• Python ingestion with BFS crawling, type-aware chunking, BGE-large embeddings, and SHA-256 dedup on upsert
• Go, Python, PostgreSQL, pgvector, Ollama, Docker

An async ingestion pipeline and REST API serving normalized XBRL data for 13K+ public companies. Repo

• End-to-end async ingestion of 10-K and 10-Q filings: fetch, parse, store, serve
• EAV data model with FastAPI endpoints for cross-company screening across 50+ financial metrics
• Python, FastAPI, PostgreSQL, async SQLAlchemy, Docker

A FastAPI service that ingests deal documents and surfaces auditable diligence risks. Repo

• Rule-based contradiction detection that links every flag back to source text via auditable evidence chains
• Claude API structured extraction from CIMs and financial statements over a Postgres deal and document model
• Deterministic EBITDA bridge calculator with base, downside, and partial-adoption scenarios
• Python, FastAPI, PostgreSQL, Claude API, PyMuPDF

A CI/CD-friendly evaluation suite and runtime gateway for LLM applications (co-authored). Repo · npm

• Six built-in evaluators including LLM-judge, PII detection, and prompt-injection checks, with 211 passing tests
• A CLI that runs eval suites inside CI/CD, plus a gateway proxy for runtime protection
• TypeScript, Node.js, Python