Senior AI Engineer

Harnham; Slough; On-site; GBP 90,000 - 140,000; Full time

Job summary

Harnham, a UK-based data and AI consultancy, is hiring a Senior & Lead AI Engineer to shape the technical direction, deliver production-grade AI solutions, and embed AI across a large, commercially focused organization.

You will own AI initiatives from concept to production, build and deploy LLMs, RAG, and agentic AI, and mentor engineers while collaborating with security, governance, and business stakeholders to raise standards and enable scalable, observable systems.

Qualifications

• Experience delivering Generative AI solutions in production.
• End-to-end AI projects from discovery to deployment.
• Deep understanding of LLMs, RAG architectures, agentic AI, orchestration, prompting, and evaluation.
• Strong software engineering foundations, APIs, cloud architectures, and system design.

Responsibilities

• Leading the design and delivery of production-grade Generative AI and AI-powered solutions
• Owning architecture decisions across AI products and platforms
• Building and deploying LLM, RAG, and agentic AI systems at enterprise scale
• Evaluating build versus buy approaches and making pragmatic technology recommendations
• Working closely with engineering, security, governance, and business stakeholders
• Driving technical standards, best practices, and reusable AI frameworks
• Supporting and mentoring engineers across multiple workstreams
• Contributing to AI strategy and helping prioritise high-value use cases
• Ensuring solutions are scalable, secure, observable, and production-ready

Skills

Generative AI production

End-to-end AI projects

LLMs / RAG / agentic AI

APIs / cloud architectures / system

Architecture decisions

Stakeholder engagement

Enterprise/regulatory environments

AWS exposure

Tools

AWS

APIs

Cloud architectures

Job description

Senior & Lead AI Engineer

This is an opportunity to join a growing AI function at a business investing heavily in artificial intelligence, automation, and digital transformation. You will play a key role in shaping technical direction, delivering production-grade AI solutions, and influencing how AI is embedded across a large, commercially focused organisation.

The Role

You will take ownership of AI initiatives from concept through to production, helping design and deliver solutions that solve real business challenges.

Responsibilities include:

• Leading the design and delivery of production-grade Generative AI and AI-powered solutions
• Owning architecture decisions across AI products and platforms
• Building and deploying LLM, RAG, and agentic AI systems at enterprise scale
• Evaluating build versus buy approaches and making pragmatic technology recommendations
• Working closely with engineering, security, governance, and business stakeholders
• Driving technical standards, best practices, and reusable AI frameworks
• Supporting and mentoring engineers across multiple workstreams
• Contributing to AI strategy and helping prioritise high-value use cases
• Ensuring solutions are scalable, secure, observable, and production-ready

Your Skills & Experience

You will bring:

• Strong commercial experience delivering Generative AI solutions into production
• Proven capability leading end-to-end AI projects from discovery through deployment
• Deep understanding of LLMs, RAG architectures, agentic AI, orchestration, prompting, and evaluation
• Strong software engineering foundations, including APIs, cloud architectures, and system design
• Experience making architecture and technology decisions within complex environments
• Ability to operate effectively in ambiguous and rapidly evolving problem spaces
• Experience collaborating with security, governance, compliance, and data protection teams
• Strong communication skills with the ability to engage technical and non-technical stakeholders
• Experience within enterprise-scale organisations, ideally in regulated environments
• Exposure to AWS and modern AI engineering practices is highly desirable