Senior Python Developer - AI

83zero Ltd; Greater London; Hybrid; GBP 60,000 - 70,000; Full time

Benefits offered by this job

Healthcare options

Job summary

83zero Ltd is seeking a Senior Python Developer to lead GenAI projects. You’ll write production-grade Python, build APIs and AI applications, and bring GenAI/LLM ideas from POC to production for enterprise clients.

This permanent, hybrid role involves 2 days per week onsite with locations including London and other UK cities. You’ll work with OpenAI, LangChain, vector databases, and cloud tools such as AWS or Azure, delivering scalable GenAI solutions.

Qualifications

• Must have strong commercial Python development experience.
• Proven leadership and mentoring experience.
• Hands-on experience with LLMs, Generative AI and RAG.

Responsibilities

• Build production applications and APIs using Python and FastAPI.
• Develop LLM, RAG and AI agent solutions.
• Build RAG pipelines covering embeddings, retrieval and generation.
• Work with OpenAI, Anthropic, Mistral, Llama and similar LLMs.
• Use LangChain, LangGraph, CrewAI or similar AI framework.
• Work with vector databases including Pinecone, Qdrant, ChromaDB and PGVector.
• Take GenAI POCs into production and scale them.
• Build APIs, microservices and AI integrations.
• Deploy solutions using AWS/Azure, Docker and Kubernetes.
• Write clean, testable and maintainable Python code.
• Work with PostgreSQL, MongoDB, Git and CI/CD.
• Collaborate with engineers, architects and client stakeholders.

Skills

Python development

LLMs/RAG

Leadership & mentoring

AI frameworks LangChain LangGraph Crew

Vector databases

CI/CD

Cloud (AWS/Azure)

Docker & Kubernetes

Software testing & Git

Agile engineering

React/TypeScript

Tools

Docker

Kubernetes

LangChain

LangGraph

CrewAI

Pinecone

Qdrant

ChromaDB

PGVector

OpenAI

Anthropic

Mistral

Llama

PostgreSQL

MongoDB

Job description

Senior Python Developer - GenAI

• Salary: £60,000 - £70,000 plus benefits, perks and healthcare options
• Locations: London, Bristol, Manchester, Glasgow or Newcastle
• Job Type: Permanent | Hybrid/2 days per week onsite | Occasional travel to client sites
• Requirements: SC eligibility & full right to work in the UK required (no sponsorship available)

The Role:

We're looking for hands-on Python Developers at Senior level who have experience building software and a practical understanding of Generative AI, LLMs and RAG.
This is a coding-focused role for engineers who enjoy building real solutions. You'll use Python as your primary development language, developing APIs, services and AI applications using technologies such as LLMs, RAG, AI agents and vector search.
You'll work across the development life cycle, helping take GenAI ideas and POC's through to robust, production-ready applications for enterprise clients.

What you'll be doing:

• Build production applications and APIs using Python and FastAPI
• Develop LLM, RAG and AI agent solutions
• Build RAG pipelines covering embeddings, retrieval and generation
• Work with OpenAI, Anthropic, Mistral, Llama and similar LLMs
• Use LangChain, LangGraph, CrewAI or similar AI framework
• Work with vector databases including Pinecone, Qdrant, ChromaDB and PGVector
• Take GenAI POCs into production and scale them
• Build APIs, microservices and AI integrations
• Deploy solutions using AWS/Azure, Docker and Kubernetes
• Write clean, testable and maintainable Python code
• Work with PostgreSQL, MongoDB, Git and CI/CD
• Collaborate with engineers, architects and client stakeholders

What we're looking for:

• Proven leadership and mentoring experience required for Senior Consultant level.
• Strong commercial Python development experience
• Experience building APIs, microservices and Back End applications
• Hands-on experience with LLMs, Generative AI and RAG
• Experience with AI frameworks such as LangChain, LangGraph or CrewAI
• Experience with vector databases and semantic search
• Experience with OpenAI, Anthropic, Mistral, Llama or similar
• Good software engineering, testing and Git practices
• Experience with AWS or Azure, Docker and ideally Kubernetes
• Experience with PostgreSQL, MongoDB or similar databases
• Experience with CI/CD using GitHub, GitLab or Jenkins
• Agile engineering experience
• Experience with AI agents, tool calling, embeddings, prompt engineering or LLM observability is beneficial
• React/TypeScript and Terraform/IaC experience is beneficial
• Experience taking GenAI POCs into production is highly beneficial

Why this role?

You'll work on real-world AI engineering projects, combining strong Python software development with modern GenAI technologies. The focus is on building and engineering, giving you the opportunity to write code, develop AI applications and solve technical problems while working with the latest LLM and RAG technologies.
You'll also have the opportunity to work directly with enterprise clients and develop your experience across both software engineering and Generative AI.

If you're a strong Python engineer with hands-on GenAI experience and want to build production-level AI applications, we'd like to hear from you.