AI Developer

Moneypenny Group; Wrexham; On-site; GBP 45,000 - 60,000; Full time

Job summary

A leading technology firm in Wrexham is seeking an experienced AI Developer to work on developing and enhancing their AI voice system. The ideal candidate will have strong Python skills, experience in LLM prompt engineering, and a good understanding of security principles. Join a passionate team working on groundbreaking technology with excellent benefits, including 25 days annual leave and a free on-site gym.

Benefits

Permanent contract

25 days annual leave plus bank holidays

Mental health support

Access to wellbeing room

Access to a 24/7 doctor line

Subsidised meals

Free on-site gym access

Epic parties

Qualifications

• Strong proficiency in Python with deep understanding of concurrency.
• Essential experience in LLM prompt engineering and optimization.
• Strong understanding of security principles and data governance.

Responsibilities

• Develop and enhance the AI system that powers voice agents.
• Handle voice processing, agent orchestration, and external integrations.
• Work on patent-pending technology at production scale.

Skills

Proficiency in Python 3.11+

Experience with Docker and Docker Compose

Experience with MongoDB

Understanding of API development patterns

Knowledge of pytest testing and Git

Experience in LLM prompt engineering

Strong understanding of security principles

Tools

Twilio APIs

Deepgram SDK

AWS/Azure

DataDog

VueJS

Job description

Join to apply for the AI Developer role at Moneypenny

We’re the leaders in outsourced calls, live chat and more, delivering brilliant conversations on behalf of businesses of all sizes. Fast-forward two decades and what started as a single, dedicated PA (who’s still with us today) looking after calls for a handful of local clients, is now a 1000‑strong team working across continents from our state‑of‑the‑art UK headquarters in Wrexham, and our US office in Atlanta.

AI Developer – AI Agent Voice Assistant Platform

Moneypenny’s AI voice agent is live, handling thousands of customer calls across the UK and US. This is a core part of our business – not a proof of concept.

We are seeking an experienced Python developer to help us scale faster. You will be developing, maintaining, and enhancing Chinwag, the AI system that powers our voice agents. Your work will cover voice processing, agent orchestration, task scheduling, and external integrations with MCP servers.

This is an exciting opportunity to work on patent‑pending technology at production scale, delivering real‑world AI solutions used daily by our customers.

What you’ll need

Core Engineering Skills

• Strong proficiency in Python 3.11+, with a deep understanding of asyncio, threading, and concurrent programming patterns.
• Experience with containerised applications using Docker and Docker Compose.
• Solid experience working with MongoDB.
• Understanding of API development patterns, including REST and integration with external services.
• Knowledge of modern development practices, including pytest testing and Git version control.

Applied AI/LLM Development

• Essential experience in LLM prompt engineering and optimisation, including designing effective system prompts, managing conversation context, and structuring prompts to ensure reliable AI agent responses and tool usage.
• Keen interest in and passion for AI technologies and their practical applications.

Security & Governance

• Strong understanding of security principles and data governance, with a focus on maintaining strict control over where sensitive data is stored and processed.

What would set you apart

• Experience with Twilio APIs for voice and SMS communications.
• Experience building commercial solutions with LLMs from Google and OpenAI.
• Working knowledge of LLM inference platforms, such as Groq.
• Experience with voice processing technologies, including Deepgram SDK and ElevenLabs.
• Knowledge of microservices architecture, particularly with MCP servers.
• Experience with cloud platforms (AWS/Azure) and CI/CD pipelines.
• Familiarity with monitoring and observability tools, particularly DataDog for LLM observability.
• Experience with task scheduling, cron jobs, and webhook integrations.
• Frontend experience with VueJS or Streamlit.

What’s included

As an AI Developer at our award‑winning headquarters in Wrexham, you’ll enjoy welcoming, spacious, state‑of‑the‑art offices, plus communal spaces including a treehouse – we like to do things differently around here! You’ll also benefit from:

• Permanent contract
• 25 days annual leave plus bank holidays (pro rata)
• Mental health support (through our Employee Assistant Programme) with access to an on‑site mental health counsellor
• Access to our wellbeing room to help enhance your physical and mental wellbeing
• Access to a 24/7 doctor line
• Subsidised meals
• Free on‑site gym access
• And did we mention our epic parties? We know how to celebrate in style!

We want to hire the whole version of you. If you require any adjustments to the recruitment process, please let us know so we can help you to be at your best!