AI/ML Engineer

Harnham - Data and Analytics Recruitment; City Of London; Hybrid; GBP 144,000 - 176,000; Full time

Benefits offered by this job

Salary up to £160,000

Job summary

Harnham - Data and Analytics Recruitment in London seeks an experienced AI/ML Engineer to design, build, and operate LLM-powered systems at scale. You will lead multi-step agent workflows, integrate foundation models, and drive production readiness while mentoring engineers and shaping technical direction.

You will work in King's Cross, London, with three days in the office and two days flexible/remote, contributing across the full SDLC and collaborating with leadership to steer AI strategy.

Qualifications

• Strong Python software engineering expertise.
• Commercial experience deploying LLM/ML systems.
• Hands-on experience with LangGraph, LangChain or similar agent orchestration frameworks.
• Strong RAG experience, including embeddings, chunking strategies, vector databases and retrieval evaluation.
• Understanding of graph-based retrieval approaches or graph data modelling principles.
• Experience with evaluation-led AI development, testing frameworks and regression controls.
• Regular use of AI-assisted development tools such as Cursor, Claude Code or similar.
• Ability to balance model performance, reliability, security and operating costs in production systems.

Responsibilities

• Build multi-step AI agent workflows.
• Develop production-scale RAG systems.
• Create evaluation frameworks and testing infra.
• Design retrieval pipelines with embeddings and vector search.
• Work with graph-based retrieval and data modelling.
• Optimize AI systems for performance and cost.
• Integrate foundation models into production.
• Collaborate to shape technical direction.
• Mentor engineers and establish best practices.
• Contribute across full SDLC using Python and cloud infra.

Skills

Python

LLM systems

LangGraph

LangChain

RAG systems

Embeddings

Vector databases

Graph retrieval

Evaluation frameworks

Cursor

Claude Code

Cost optimization

Tools

Weaviate

Qdrant

pgvector

Neo4j

LangSmith

LangFuse

Job description

AI/ML Engineer

Up to £160,000

King's Cross, London (3 days a week)

This is an opportunity to join a well-funded AI business at a pivotal stage of growth, building production-grade AI systems that solve complex, real-world problems. You'll work on agentic AI, retrieval systems, evaluation frameworks and enterprise-scale LLM applications, with the chance to influence both technology decisions and product direction.

THE COMPANY

They are an ambitious technology business developing an AI-powered platform that helps investment professionals access information, automate complex workflows and make better decisions at scale. Their platform combines proprietary data, external sources and advanced AI capabilities within a secure enterprise environment.

Backed by an established organisation with deep domain expertise and a strong client network, they offer the agility of a startup alongside the stability and resources of a proven business. The engineering team is being built with a strong emphasis on ownership, collaboration and technical excellence.

THE ROLE

As a AI/ML Engineer, you will help design, build and operate the LLM-powered systems at the core of the platform, taking AI products from experimentation to reliable production deployment.

Specifically, you can expect to be involved in the following:

• Building multi-step AI agent workflows using modern orchestration frameworks
• Developing production-scale retrieval augmented generation (RAG) systems
• Creating evaluation frameworks, testing infrastructure and monitoring capabilities for AI applications
• Designing retrieval pipelines including embeddings, vector search, reranking and knowledge retrieval
• Working with graph-based retrieval and data modelling approaches
• Optimising AI systems for accuracy, latency, scalability and cost efficiency
• Integrating leading foundation models into production environments
• Collaborating closely with engineering leadership to shape technical direction
• Mentoring engineers and helping establish best practices for AI development at Lead level
• Contributing across the full software development lifecycle using Python and cloud-based infrastructure

SKILLS AND EXPERIENCE

The successful AI/ML Engineer will have the following skills and experience:

• Strong Python software engineering expertise
• Commercial experience developing and deploying LLM or machine learning systems
• Hands-on experience with LangGraph, LangChain or similar agent orchestration frameworks
• Strong RAG experience, including embeddings, chunking strategies, vector databases and retrieval evaluation
• Understanding of graph-based retrieval approaches or graph data modelling principles
• Experience with evaluation-led AI development, testing frameworks and regression controls
• Regular use of AI-assisted development tools such as Cursor, Claude Code or similar
• Ability to balance model performance, reliability, security and operating costs in production systems

Desirable skills include:

• Qdrant, Weaviate or pgvector
• Neo4j, GraphRAG and Cypher
• MCP server development
• LangSmith, LangFuse or similar observability platforms
• Fine-tuning, embedding model selection or open-weight model deployment
• Experience working with complex document-heavy environments

BENEFITS

The successful AI/ML Engineer will receive the following benefits:

• Salary up to £130,000 - depending on experience