Senior AI Engineer - Agents in Fintech

Harnham; Greater London; Hybrid; GBP 80,000 - 95,000; Full time

Job summary

Harnham is expanding its AI delivery capability in the UK and seeks a Senior AI Engineer to design, build and productionise LLM-powered applications with end-to-end ownership. You will collaborate with engineering, data science, security and business teams on multiple enterprise use cases, including RAG-enabled assistants and AI-driven workflows.

You will join a fast-paced environment with autonomy across active AI initiatives, contributing to secure and scalable AI delivery within a regulated

Qualifications

• Senior AI Engineer with end-to-end ownership across AI initiatives.
• Experience building LLM-powered applications and productionising AI solutions.
• Ability to work with security and data protection teams.

Responsibilities

• Design, build and productionise LLM and Generative AI applications.
• Develop solutions using RAG, conversational AI and AI-driven workflows.
• Own technical delivery from architecture through to production deployment.
• Integrate AI applications with enterprise systems and data sources.
• Make architectural recommendations and evaluate build-vs-buy decisions.
• Partner with InfoSec and Data Protection teams on secure AI delivery.
• Communicate technical decisions and trade-offs across engineering and business teams.

Job description

Looking to build production GenAI products with measurable business impact?

Want to solve the challenges of deploying LLM applications across a large, regulated organisation?

Interested in joining a growing AI function with end-to-end ownership across multiple enterprise use cases?

A major UK financial services business is expanding its AI delivery capability and hiring a Senior AI Engineer. The wider MLOps function includes 12–15 engineers, with this role sitting within a small AI delivery team focused on building and productionising AI solutions across the business. Current projects include a RAG-based contact centre assistant, AI-supported complaints handling and extracting fraud signals from network graphs. You'll join a fast-paced environment with significant autonomy across several active AI initiatives.

The Senior AI Engineer will design, build and productionise LLM-powered applications while working across engineering, data science, security and business teams. You'll have end-to-end technical ownership with scope to influence architecture, technical recommendations and build-vs-buy decisions.

Key Responsibilities

• Design, build and productionise LLM and Generative AI applications
• Develop solutions using RAG, conversational AI and AI-driven workflows
• Own technical delivery from architecture through to production deployment
• Integrate AI applications with enterprise systems and data sources
• Make architectural recommendations and evaluate build-vs-buy decisions
• Partner with InfoSec and Data Protection teams on secure AI delivery
• Communicate technical decisions and trade-offs across engineering and business teams

Salary range

Up to £95,000 base + 15% annual bonus

Working model

Hybrid, 2–3 days per week in the London office

Tech stack

Production LLMs / Generative AI, RAG, AWS ideally. Further stack details not confirmed.