Vignesh Pattalam Bharathkumar

Vignesh

Staff Software Engineer, founding engineer of an applied-AI platform

I build agentic LLM products (RAG, natural-language analytics, eval loops) that cut analysis from weeks to hours. 9 years across backend, data, and AI.

01

Selected Work

Sagan Agents

Founding engineer

Applied-AI platform for pharma market research. The Data Archive Copilot returns cited answers over 10 years of structured and unstructured data (RAG with eval loops). Multi-tenant on AWS.

5 clients in the first 2 months, 15+ internal teams.

FastAPI Temporal per-tenant Postgres AWS RAG

Dashboard Builder

Analytics

Natural language to live analytics, paired with a self-improving evals system that tightens accuracy over time.

NL to SQL evals

Gen-AI Survey Automation

LangGraph

Stateful LangGraph pipeline with per-state Langfuse evals. Survey programming dropped from days to minutes.

LangGraph Langfuse

Langfuse Python SDK

open source

Merged PR fixing AWS Bedrock token-usage tracking.

github.com/langfuse/langfuse-python/pull/1267