GenAI/Python Developer – AI/ML

Photon; New York (NY); On-site; USD 150,000 - 210,000; Full time

Job summary

Photon is seeking an experienced GenAI/Python Developer to design, build, and deploy production-grade Generative AI applications and intelligent agent-based solutions. You will design, develop, and orchestrate sophisticated GenAI workflows using LangGraph, LangChain, and multi-agent architectures, and build robust RAG systems with LlamaIndex and vector databases.

The role requires hands-on experience with OpenAI, Anthropic, Llama, Mistral models, back-end APIs in Python, FastAPI, and

Qualifications

• Experience building GenAI applications and production-grade systems.
• Strong Python development and API design with FastAPI.
• Experience with retrieval-augmented generation and vector databases.
• Experience with multiple LLMs (OpenAI, Anthropic, etc.) and cost-aware selection.
• Ability to optimize latency and cost for production AI workloads.

Responsibilities

• Design, develop, and orchestrate GenAI workflows using LangGraph, LangChain, and multi-agent architectures.
• Build and maintain RAG solutions with LlamaIndex and vector databases.
• Create retrieval pipelines to improve LLM response accuracy and relevance.
• Evaluate and integrate OpenAI, Anthropic, Llama, Mistral models based on performance and cost.
• Develop scalable backend services and APIs using Python and FastAPI.

Skills

Python

GenAI design

LLM integration

Multi-agent architectures

Prompt engineering

Performance optimization

Tools

LangGraph

LangChain

LlamaIndex

Vector databases

PyTorch

TensorFlow

Hugging Face

LoRA

QLoRA

LangSmith

Langfuse

Docker

CI/CD

FastAPI

AWS

Azure

GCP

Job description

We are looking for an experienced GenAI/Python Developer to design, build, and deploy production-grade Generative AI applications and intelligent agent-based solutions. The ideal candidate will have strong expertise in Python, LangGraph, LangChain, LlamaIndex, RAG, vector databases, LLM integration, and multi-agent architectures.

The role requires hands-on experience building scalable AI solutions, integrating commercial and open-source LLMs, fine-tuning models, and optimizing GenAI applications for performance, latency, cost, reliability, and production scalability.

Key Responsibilities

• Design, develop, and orchestrate sophisticated Generative AI workflows using LangGraph, LangChain, and multi-agent architectures.
• Build and maintain advanced Retrieval-Augmented Generation (RAG) solutions using LlamaIndex and vector databases.
• Design retrieval pipelines focused on improving the accuracy and relevance of LLM-generated responses.
• Integrate and evaluate multiple commercial and open-source LLMs, including OpenAI, Anthropic, Llama, and Mistral, based on application, performance, and cost requirements.
• Develop scalable and high-performance backend services and APIs using Python, FastAPI, and asynchronous programming.
• Fine-tune and customize LLMs for domain-specific use cases using PyTorch, TensorFlow, Hugging Face, LoRA, and QLoRA.
• Apply advanced prompt engineering techniques to improve LLM response quality and application performance.
• Optimize GenAI workflows for latency, cost, scalability, and reliability.
• Implement monitoring and observability for LLM applications using tools such as LangSmith and Langfuse.
• Containerize AI applications and services using Docker and support production deployments through CI/CD pipelines.
• Deploy and maintain GenAI solutions across cloud environments such as AWS, Azure, or GCP.
• Collaborate with engineering, AI/ML, architecture, and product teams to convert business requirements into scalable AI solutions.
• Troubleshoot and optimize production AI applications, APIs, retrieval pipelines, and model integrations.