Latest LLM Engineer Jobs

Senior AI Engineer

This role involves designing and implementing backend security guardrails for Generative AI workflows, building and deploying enterprise-level GenAI and ML solutions, and integrating user interfaces. The position also includes working with cloud infrastructure and maintaining production applications.

Randstad Technologies Recruitment London, United Kingdom £432 – £484 pd

Senior AI Engineer

This role involves designing, building, and scaling enterprise-grade AI platforms, transforming AI research into production systems. You'll work on complex AI services, data pipelines, and cloud-native architectures, collaborating with Data Scientists and Software Engineers to productionize ML and NLP models.

Infused Solutions London, United Kingdom £65,000 – £75,000 pa

Hybrid Permanent Flexible

Applied AI Engineer

The role involves designing and building AI systems using LLMs, RAG, and related technologies, while working closely with research and engineering teams. Responsibilities include developing and maintaining high-quality production software, architecting microservice-based systems, and providing technical guidance to junior engineers.

SoCode London, United Kingdom £120,000 – £140,000 pa

Python AI Engineer

This role involves developing and maintaining production-grade Python services for Generative AI and RAG solutions. Responsibilities include building and integrating LLM workflows, implementing retrieval and evidence processing, and optimizing response quality and performance.

Square One Resources London, United Kingdom £600 – £700 pd

Senior AI Engineer

This role involves leading the development of AI features in a legal tech SaaS platform, focusing on designing and building ML models for document parsing, search, classification, and summarisation. You will integrate LLMs into product workflows, optimise model serving on AWS, and work closely with engineering, product, and QA teams in Scrum squads.

Parkside London, United Kingdom £100,000 – £150,000 pa

Applied AI Engineer

This role involves hands-on engineering to build, improve, and maintain production LLM systems. You'll focus on optimizing cost and latency, designing evaluation frameworks, and solving real production issues. The role offers the opportunity to influence product evolution and work closely with the Product team.

WeDoTech London, United Kingdom £120,000 – £140,000 pa

Senior AI Engineer - up to+ Bonus

This role involves designing, developing, and deploying AI agents to automate business processes and improve operational efficiency. The Senior AI Engineer will work closely with stakeholders to identify AI opportunities, develop agentic AI workflows, and integrate solutions with existing systems.

Involved Solutions London, United Kingdom £80,000 – £100,000 pa

Remote

Research Engineer, Machine Learning (Reinforcement Learning)

This role involves advancing reinforcement learning in large language models, focusing on developing agentic systems for computer use, code generation, and reasoning. The engineer will build scalable RL infrastructure, design training environments, and collaborate across research and engineering to implement safety and performance improvements at scale.

Anthropic London, United Kingdom £260,000 – £630,000 pa

Research Engineer, Pretraining Scaling - London

This role involves owning critical parts of Anthropic's production pretraining pipeline for large language models, focusing on reliability, performance optimization, and debugging across hardware, networking, and training dynamics. The engineer will run experiments to improve training efficiency, respond to incidents during model launches, and collaborate closely with research and systems teams. It’s a high-impact, operational role blending deep technical engineering with empirical research in a fast-paced, safety-focused AI environment.

Anthropic London, United Kingdom £260,000 – £630,000 pa

Fullstack Engineer

The role involves designing, building, and shipping a secure, data-heavy AI work-execution platform for alternative investment firms. Responsibilities include developing interfaces, services, and APIs, managing data models, implementing security features, and collaborating with the AI/ML team to deliver trusted and auditable features.

Oscar Technology London, United Kingdom £70,000 – £100,000 pa

Senior AI Engineer

The Senior AI Engineer will design and develop production-grade AI systems, focusing on RAG pipelines, generative AI workflows, and LLM optimization. Key responsibilities include building scalable solutions, implementing retrieval strategies, and mentoring junior engineers within a growing AI team.

The Portfolio Group London, United Kingdom £80,000 pa

On-site Permanent

Senior Product Engineer

This role involves building and scaling an AI-powered behavioural intelligence platform, focusing on LLM-enabled features and RAG workflows. The engineer will own product architecture and development, working closely with leadership to shape the roadmap. It's a high-impact position in a funded startup transitioning from proof-of-concept to commercial deployment.

Harnham - Data and Analytics Recruitment London, United Kingdom £110,000 – £140,000 pa

Analytics Engineer

This role involves designing, building, and maintaining data models using dbt and BigQuery, working closely with Data Engineering and analysts to ensure scalable and high-quality data products. You will also implement data quality practices, support AI/LLM tools, and optimize query performance.

Harnham - Data and Analytics Recruitment London, United Kingdom £75,000 – £80,000 pa

AI Engineer

As an AI Engineer, you will collaborate with cross-functional teams to design, develop, and deploy data pipelines, machine learning models, and AI-enabled applications. Your role involves working with modern data and AI technologies to deliver scalable, production-ready solutions that drive business value through analytics, automation, and digital transformation.

HAYS Specialist Recruitment Manchester, United Kingdom

On-site Permanent Clearance Required

Senior AI Engineer

Design and implement end-to-end AI/ML systems using generative AI, LLMs, and agentic frameworks to extract insights from biomedical literature and data. Focus on production-grade reliability, model quality, and collaboration with product and engineering teams to deliver user-facing features. Mentor junior engineers and contribute to a culture of technical excellence and knowledge sharing.

Causaly London, United Kingdom

Hybrid Permanent