Senior AI/LLM Engineer – Multi-Agent Pipelines & Tooling

ZealHire Inc.; St. Louis, Northern (MO, KY); Hybrid; USD 120,000 - 210,000; Full time

Job summary

ZealHire Inc. seeks a Senior Tech Mobile Agentic AI Developer to design and deploy LLM-powered agents and multi-agent orchestration pipelines for field technicians, on a contractual basis in St. Louis, MO.

You will work with the platform team to build real-time streaming, tool-calling agents, and robust AI workflows. Ideal candidates have 10+ years of Python production experience, 2+ years in LLM development with LangChain/LangGraph, and strong system design skills.

Qualifications

• 10+ years of software development in production environments.
• 2+ years of hands-on LLM development with LangChain/LangGraph or equivalents.
• RAG pipelines with embeddings, vector search, re-ranking, and answer generation.
• LLM APIs including OpenAI Chat Completions, streaming, tool calling.
• Async Python with asyncio/httpx/FastAPI.
• Prompt engineering with system prompts and JSON outputs.
• PostgreSQL async ORMs with CI/CD basics.
• Git, CI/CD, Docker, Kubernetes fundamentals.
• Strong microservices and distributed systems design skills.

Responsibilities

• Design and implement LLM-powered agents and multi-agent orchestration pipelines.
• Develop real-time streaming capabilities (WebSocket/SSE) for conversational AI.
• Integrate with Azure OpenAI APIs and implement circuit breakers and fallbacks.
• Build and deploy RAG pipelines with hybrid search and RR Fusion.
• Write production-grade Python with robust logging, observability, and tests.
• Review code and participate in architectural discussions and sprints.

Skills

Python

LLM development

RAG pipelines

LLM APIs

Async Python

Prompt engineering

Resilient service design

PostgreSQL async

Git CI/CD

Docker/Kubernetes

System design

Tools

LangChain

LangGraph

Azure OpenAI

FastAPI

PostgreSQL

OpenSearch

WebSocket

SSE

SQLAlchemy async

Alembic

Docker

Kubernetes

Job description

ZealHire Inc. seeks a Senior Tech Mobile Agentic AI Developer to design and deploy LLM-powered agents and multi-agent orchestration pipelines for field technicians, on a contractual basis in St. Louis, MO.

You will work with the platform team to build real-time streaming, tool-calling agents, and robust AI workflows. Ideal candidates have 10+ years of Python production experience, 2+ years in LLM development with LangChain/LangGraph, and strong system design skills.