Job Title:

Senior Applied AI Engineer

Salary:

Up to £140,000 base

Location:

London – Moorgate | Hybrid, 2 days per week in the office

Work Type:

Permanent

Role:

We’re working with an exciting AI technology business looking for a Senior Applied AI Engineer to join the team building and improving its production LLM systems.

This is a hands-on engineering role for someone who wants to work on real-world AI problems where the technology is already being used in production. Rather than focusing on training models or open-ended research, you’ll be solving the challenges that come with making LLM-powered products genuinely work at scale.

You’ll have the opportunity to influence how the product evolves, working closely with Product to improve quality, reduce cost and latency, build better evaluation frameworks and solve real production failures.

The engineering environment is also heavily AI-native, with tools such as Claude Code forming a key part of how the team builds and ships software.

Responsibilities:

• Build, improve and maintain production LLM systems
• Improve the cost and latency of LLM-powered features without sacrificing accuracy
• Design and implement evaluation frameworks that can reliably measure whether changes genuinely improve the product
• Investigate production failures raised by analysts, identify root causes and implement effective fixes
• Work across areas including RAG, prompting and agentic systems
• Partner closely with Product to shape new functionality and take ideas through to production
• Use AI-native engineering tools such as Claude Code as part of your day-to-day development workflow
• Make sound technical decisions when working through ambiguous engineering problems