Senior Python Engineer

Areti Group | B Corp™; Greater London; On-site; GBP 63,000 - 77,000; Full time

Job summary

Areti Group | B Corp™ in London is seeking a Senior Python Engineer to help build the next generation of its AI-powered engineering platform. You will own production-grade Python services, APIs and agentic systems, shaping architecture, infrastructure and delivery from day one.

You'll focus on production readiness, security and reliability while integrating LLM-powered applications, agent orchestration and tool calling. This role is hands-on and impact-driven, not traditional data science.

Qualifications

• Senior-level backend/software engineering experience.
• Experience building APIs, services or microservices.
• Production experience with LLMs, GenAI or AI agents.
• Actual experience shipping AI-powered systems.

Responsibilities

• Build production Python services and APIs.
• Design and integrate LLM-powered apps and AI agents.
• Agent orchestration, tool calling and RAG.
• Authentication, permissions and AI guardrails implementation.
• Evaluation, monitoring and observability of systems.
• Cloud infrastructure and deployment.
• Docker, CI/CD and production engineering.
• Using AI coding tools like Cursor or Claude Code.
• Shape AI adoption across the engineering team.

Skills

Python

API design

Backend development

AI/Agentic systems

LLMs / GenAI

Testing & security

Production systems

Cloud experience

Tools

Claude Code

Cursor

LangChain

LangGraph

AWS

Azure

Job description

Senior Python Engineer - AI & Agentic Systems | London | £70k

Build production AI agents

I'm working with a high-growth, technology-led business that is investing heavily in AI and looking for a Senior Python Engineer to help build the next generation of its engineering platform.

This is not a traditional Data Science or ML role.

You'll be a hands-on software engineer building production-grade Python services, APIs and AI-powered systems, with real ownership over architecture, infrastructure and delivery.

What you'll be working on

You'll help build and scale an agentic AI platform that brings AI into real business workflows, with a strong focus on security, reliability and engineering quality.

You'll be involved in:

• Building production Python services and APIs
• Designing and integrating LLM-powered applications and AI agents
• Agent orchestration, tool calling and RAG
• Authentication, permissions and AI guardrails
• Evaluation, monitoring and observability
• Cloud infrastructure and deployment
• Docker, CI/CD and production engineering
• Using tools such as Claude Code, Cursor or similar
• Helping shape how AI is adopted across the wider engineering team

What we're looking for

We're looking for a strong software engineer first, with genuine experience building with AI.

You'll ideally have:

• Senior-level backend/software engineering experience
• Experience building APIs, services or microservices
• Production experience with LLMs, GenAI or AI agents
• Experience with RAG, tool calling, LangChain, LangGraph, MCP or similar
• AWS or Azure experience
• Strong understanding of testing, security and production systems
• Experience using AI coding tools such as Cursor or Claude Code

Most importantly, we're looking for someone who has actually built and shipped AI-powered systems, rather than someone whose AI experience is limited to experimentation.

This is a genuine opportunity to have a major influence on how AI is used across an engineering organisation.

You'll have ownership over technical decisions, work on production agentic systems and help shape the standards around security, deployment and AI-assisted development.

If you're a Senior Python Engineer who wants to move deeper into production AI and agentic systems, I'd love to hear from you.