// machine learning engineer

Ashhad Ahsan Rehman

I build AI systems that ship — multi-agent workflows, RAG pipelines, and production LLM apps. 6+ years. Koblenz, Germany — open to relocation.

langgraph

multi-agent

rag

llms

production-ml

View work $ contact

6+ years

9 projects

5 oss libs

6 articles

$ ls selected-work/

Roost
Open-source Postgres-backed job queue for Python. No Redis, no RabbitMQ — just your existing Postgres. Transactional enqueue, LISTEN/NOTIFY, crash recovery, and a live dashboard. 15,289 jobs/sec on a single async connection.

pythonpostgresqlfastapiopen-source
Agent-UniRAG
Open-source trainable LLM agent framework for unified single-hop and multi-hop question answering. Five-node LangGraph state machine with ChromaDB, FastAPI streaming, and a Next.js UI. Based on arXiv research.

langgraphragfastapipython
KERAG
Implementation of Knowledge-Enhanced RAG (arXiv:2509.04716): combines SPARQL-based knowledge graphs with LLM relevance scoring and Chain-of-Thought reasoning for complex multi-hop QA. LangChain, LangGraph, multi-provider LLM support.

ragknowledge graphslanggraphlangchain
GameMind Agent
Conversational AI platform for game developers using LangGraph with PostgreSQL vector embeddings. Boosts idea recall accuracy by 65% through semantic memory retrieval and automated visualization. Built at Schoene Neue Kinder GmbH (Munich, remote).

langgraphragpostgresqlpython

$ pip list | grep ashhad

$ cat writing/