AI Prompt Engineer: Create High-Impact LLM Prompts

Moonfire; New Jersey; On-site; USD 110,000 - 170,000; Full time

Job summary

Moonfire is seeking an AI Prompt Engineer to design, optimize, and evaluate prompts for Generative AI and LLMs. The role collaborates with stakeholders, data scientists, and product teams to improve accuracy, safety, and user experience across enterprise use cases.

The position requires hands-on experience with OpenAI/Claude, Python, and frameworks like LangChain or LlamaIndex. Onsite work in Whippany, NJ is required, with strong emphasis on governance and documentation.

Qualifications

• Design, test and refine prompts for LLMs in enterprise use cases.
• Familiarity with prompt patterns and assessment of outputs.
• Hands-on AI development with Python and related frameworks.

Responsibilities

• Design, develop, test, and refine prompts for LLMs used in enterprise apps.
• Create and enforce prompt engineering best practices.
• Evaluate outputs and optimize prompts for safety and relevance.
• Develop prompt libraries, chains, and AI agent workflows.
• Collaborate with data scientists, AI engineers, and product teams.

Skills

Generative AI & LLMs

Prompt engineering

OpenAI/ Claude experience

Python

LangChain / LangGraph / LlamaIndex

Vector databases (Pinecone)

RAG architectures

Prompt patterns (Zero-shot, Few-shot,

Documentation & governance

Tools

LangChain

LangGraph

LlamaIndex

Semantic Kernel

Pinecone

Job description

Moonfire is seeking an AI Prompt Engineer to design, optimize, and evaluate prompts for Generative AI and LLMs. The role collaborates with stakeholders, data scientists, and product teams to improve accuracy, safety, and user experience across enterprise use cases.

The position requires hands-on experience with OpenAI/Claude, Python, and frameworks like LangChain or LlamaIndex. Onsite work in Whippany, NJ is required, with strong emphasis on governance and documentation.