AI Engineer in Newbury

Location: Newbury / London (Hybrid working – office 2‑3 days per week)

Working Hours: Full time 37.5 hours per week – Mon – Fri

In this hands‑on AI Engineering role you will build production‑grade AI products within a highly specialised environment, working alongside Senior and Principal AI Engineers who set the architectural direction while you focus on building features, integrating models, and shipping working software. You will join the AI & Data Science team at VodafoneThree to build intelligent internal applications that drive operational efficiency and reduce costs across the organisation. You will develop practical skills in retrieval‑augmented generation, agentic patterns, and LLM application design, making this an ideal first step for a technically inclined individual seeking real AI engineering exposure.

Key Roles & Responsibilities

• Develop and test AI‑powered application features in line with the product roadmap
• Implement retrieval‑augmented generation (RAG) systems, prompt templates, and conversational interfaces
• Build and maintain API integrations between AI models and application layers
• Write clean, tested, and maintainable code following team engineering standards and best practices
• Contribute to prompt engineering, guardrail implementation, and content filtering to ensure safe and reliable AI interactions
• Support deployment and release processes for AI products, collaborating with the team on production readiness
• Monitor application performance, identify bottlenecks, and respond to production issues
• Participate in code reviews and contribute to shared technical documentation and reusable components
• Work with the UX Manager to implement intuitive user interfaces and gather user feedback
• Support governance and compliance requirements for AI product releases

Qualifications

• Personal Github projects will be considered for individuals looking to move into the field, but they must be at a high standard. This role is expected to be a builder of AI Products, not just a user of AI.
• Minimum Bachelors or MSc in Computer Science, Software Engineering or another relevant STEM field relating to AI development
• Experience building and shipping AI‑powered applications
• Working knowledge of LLM integration patterns: prompt engineering, RAG, agent frameworks, orchestration tooling
• Production engineering skills: API development, application architecture, integration with existing business systems
• Awareness of non‑functional considerations in AI products (latency, cost, safety, observability)
• Ability to operate in a fast‑moving tech stack, evaluating new tools pragmatically and managing technical debt

What we offer

We care about our people’s success by offering great pay, bonuses, up to 28 days off plus bank holidays, and paid time for charity work. You can personalise our benefits for you and your family, like discounts, vouchers, a pension plan and more. We help with your career through our learning tools and supportive parental leave policies.

Legal & Practical Information

Closing Date: 31st July 2026

We are regulated by the Financial Conduct Authority and all offers of employment for this role are subject to background checks, including criminal (DBS) and financial checks to meet the regulator’s standards. We believe everyone should have the opportunity to interview for a role that matches their skills. In collaboration with our Talent, Diversity & Inclusion teams and our employee‑led DEI Networks, we have identified a range of reasonable adjustments to help you feel comfortable and perform at your best self during the interview process. If you require any reasonable adjustments or have an accessibility request as part of your recruitment journey – for example, extended time or breaks in between online assessments, a sign language interpreter, or assistive technology – please contact your recruiter directly or email jobs@three.co.uk for guidance.

We use AI in different parts of our business to boost innovation, improve efficiency, and create new opportunities. We know many candidates use AI to fine‑tune their CVs or prepare for interviews, but what we really care about is your unique experiences and achievements. During the interview, we want you to rely on your own knowledge and skills to show us who you really are—your personality, creativity, and abilities. Above all, we’re looking for authenticity and can’t wait to get to know the real you.