Senior AI Engineer

Senior AI Engineer x 2 Contract - Outside IR35 - 6 months+ Oxfordshire OR London £700 - £900 per day DOE

Our client is a rapidly scaling UK deep-tech company delivering advanced AI capability into some of the most consequence-heavy environments there are: defence and national security, critical national infrastructure, and enterprise clients whose decisions carry real weight. They're hiring two Senior Applied AI Engineers to take ownership of the agentic AI systems underpinning their platform, on a contract basis, with genuine influence over how those systems are architected and delivered.

This role suits an engineer who designs and ships systems rather than assembling pre-built components - someone who cares more about how a system performs once it's live and under pressure than how impressive it looks in a demo.

What You'll Be Doing

Architecting and building multi-agent AI systems end-to-end, combining frameworks such as LangGraph or Haystack where they add value with bespoke orchestration, state management and tool-calling logic where a framework won't cut it

Writing production-grade code with reliability, latency and graceful failure handling designed in from the start rather than bolted on afterwards

Embedding LLMs and vision-language models into live reasoning, search, summarisation and task-execution workflows, backed by solid retrieval, memory and guardrail design

Deploying across cloud, on-premises and fully offline/air-gapped settings, adapting your approach to each environment's security and connectivity constraints

Taking end-to-end ownership of production pipelines, from raw data ingestion through to live inference

Building the monitoring, evaluation and guardrail tooling that shows how a system is actually performing in the field

Setting technical standards for agentic AI within the team, establishing the patterns other engineers follow and leaving clear documentation behind

What We're Looking For

Robust software engineering, including developing LLM-powered or agentic systems, and a track record operating at senior/lead level

Strong engineering fundamentals - code that's clean, tested and built to last, not just prototypes that work once

Commercial track record building and owning multi-agent or agentic AI systems in live production settings, as an engineer rather than an integrator

Strong Python skills, comfortable working with LangGraph, LangChain, Haystack or similar, and equally comfortable dropping below the framework when that's the right call