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AI / Machine Learning Engineer – Agentic AI & LLM Systems

Experis UK • Contractor • london, south east england, uk • 22h ago

AI / Machine Learning Engineer – Agentic AI & LLM Systems

We’re partnered with a pioneering AI organisation pushing the boundaries of Agentic AI — building systems where LLMs reason, act, and collaborate autonomously to drive real-world outcomes.

As a Machine Learning Engineer, you’ll design the frameworks, tools, and data loops that allow intelligent agents to think, plan, and improve themselves — transforming raw model power into adaptive, high-performing AI systems.

What You’ll Do:

Build Agentic Systems – Develop and optimise LLM-based agents that can reason, plan, and execute multi-step tasks autonomously.
Enhance LLM Reasoning – Apply reinforcement learning, tool use, and reflection techniques to strengthen decision-making and contextual understanding.
Design Scalable Frameworks – Create data pipelines, annotation tools, and evaluation flywheels that accelerate model iteration and feedback loops.
Collaborate with Research Teams – Translate experimental findings into production-grade systems that extend the autonomy and reliability of agents.
Run Experiments End-to-End – Own your compute environment (e.g. Jupyter, Colab, Databricks) and iterate on large-scale LLM training and evaluation.

What You’ll Bring:

4+ years’ experience in Machine Learning or AI, with exposure to LLM agent systems, tool-use frameworks, or generative AI.
Advanced proficiency in Python and ML frameworks such as PyTorch or TensorFlow.
Hands-on experience developing or fine-tuning LLaMA, GPT, or similar foundation models.
Understanding of agentic architectures, chain-of-thought reasoning, and memory/reflection mechanisms.
Proven ability to debug, optimise, and scale ML experiments and compute pipelines.
MSc or PhD in AI, Computer Science, or related field.

Bonus Skills:

Research track record (papers, open-source, Kaggle).
Experience building back-end APIs or front-end interfaces for model annotation or experimentation.

Contract Details:

Competitive Rates (Outside IR35)
6–12 months (with likely extension)
Remote – UK based

Please apply for immediate consideration.

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