Rishabh Kumar

I build AI systems that run in production and don't fail silently.

Production RAG, voice agents, and multi-agent orchestration for teams where latency and correctness matter when a real customer is waiting.

Systems I've built & run6 shipped

Milo

in production
Connectivity CX · AI Engineer

Autonomous email assistant for automotive dealerships. Reads inbound leads and replies to customers with business-hours logic, follow-up scheduling, and a full audit trail. Multi-tenant data handling with strict per-tenant isolation and sub-500ms hybrid retrieval.

P50 < 500ms
PythonFastAPIGPT-4oPostgreSQL

Hotelzify Voice AI

shipped
Hotelzify · AI Engineer

Real-time voice support: several specialized agents under a supervisor, with streaming speech-to-text and text-to-speech over phone lines. Indexed 1M+ records at 98% retrieval accuracy.

98% retrieval · 300ms P99
PythonLangGraphRealtime VoiceNLP
Solo · visual AI workflow builder

Visual AI workflow builder. A drag-and-drop canvas of 13 node types to compose multi-step AI pipelines with no code. Multi-LLM routing, row-level-secure auth, usage-based billing, and a browser capture extension.

200+ active users
Next.jsMulti-LLMSupabase

CogniDB

open source
Open source · NL → SQL

Open-source library for querying databases in plain English across MySQL, Postgres, and MongoDB through one interface. Semantic caching cuts inference cost ~40%; a validation pass guards against SQL injection.

200+ stars · −40% cost
PythonNL → SQLNLP

Marki

shipped
Marki (LA) · Full-Stack ML

Recommendation engine with transformer embeddings: +28% engagement, +15% average order value. Real-time inference API serving 1M+ predictions a day at 45ms P50, with an automated training-to-deploy pipeline on multiple GPUs.

1M+ preds/day @ 45ms
PythonFastAPIRecsysMLOps

OneTicket

open source
Smart India Hackathon

Multilingual event-booking assistant on GPT-4o with live database tools (search, book, cancel), web search, and SMS. Placed top 5 of 800+ projects at the Smart India Hackathon.

top 5 / 800+ projects
GPT-4oLangGraphTypeScript
Writing on production AI failures2 pieces

If your evals pass but failures still reach users, I can help you build the harness layer that catches them first.

I take on a few hands-on builds a quarter for teams shipping latency-sensitive AI in production.