Product AI Engineer

Harnham; San Francisco (CA); On-site; USD 150,000 - 250,000; Full time

Job summary

Harnham is seeking a Senior AI Product Engineer in the Bay Area to own customer-facing AI experiences end-to-end, transforming LLMs, agents and RAG into polished products. You’ll work across React/TypeScript, Node.js and Python to deliver streaming, real-time AI interfaces with human-in-the-loop and robust evaluation signals.

You should have 5+ years of software engineering, 2+ years in AI-powered product teams, and solid backend skills with Node.js or Python.

Qualifications

• 5+ years of software engineering experience.
• 2+ years building AI-powered products in production.
• Backend expertise with Node.js and/or Python.
• Hands-on with LLM APIs, RAG, prompts.
• Experience building streaming or real-time user experiences.
• Strong product instincts and collaboration with Product, Design and AI/ML teams.
• Knowledge of AI evals, security/compliance a bonus.

Responsibilities

• Own customer-facing AI experiences end-to-end.
• Develop AI-powered features across React/TypeScript, Node.js and Python.
• Implement agent workflows and multi-step AI experiences.
• Build streaming or real-time UI experiences using SSE/WebSockets.
• Create reusable patterns for AI state management, streaming and evaluation.
• Collaborate with Product, Design and AI/ML teams to ship polished products.

Skills

Software engineering

AI product development

Node.js

Python

LLM APIs

RAG

Prompt engineering

LangGraph / LangChain

Realtime UX

Tools

LangChain

LangGraph

Job description

Senior AI Product Engineer | Up to $250K Base + Equity | Bay Area

I’m hiring a Senior AI Product Engineer to join a fast-growing technology company building the next generation of AI-powered enterprise software.

This is a product engineering role, not an AI infrastructure position. You’ll own customer-facing AI experiences end-to-end, taking the capabilities of LLMs, agents and RAG systems and turning them into polished products that customers actually use.

What you’ll be building:

• AI-powered features across React/TypeScript, Node.js and Python
• Agentic workflows and multi-step AI experiences
• RAG-powered product experiences and intelligent automation
• Streaming and real-time AI interfaces using SSE/WebSockets
• Human-in-the-loop workflows, feedback mechanisms and AI quality signals
• Reusable patterns for AI state management, streaming and evaluation

What I’m looking for:

• 5+ years of software engineering experience
• 2+ years building AI-powered products in production
• Solid backend experience with Node.js and/or Python
• Hands-on experience with LLM APIs, RAG, structured outputs and prompt engineering
• Exposure to agent frameworks such as LangGraph, LangChain or custom agent runtimes
• Experience building streaming or real-time user experiences
• Strong product instincts and the ability to work closely with Product, Design and AI/ML teams

Experience with AI evals, Braintrust, MCP, feedback/annotation tooling or enterprise security/compliance products would be a bonus.