Machine Learning Quality Engineer

London Stock Exchange Group; Greater London; On-site; GBP 70,000 - 100,000; Full time

Benefits offered by this job

Healthcare

Retirement planning

Paid volunteering days

Wellbeing initiatives

Job summary

The London Stock Exchange Group is seeking a Senior Quality Engineer to join the Corporate Engineering AI team. You will design, implement, and maintain evaluation frameworks for MCP tools and Skills, and collaborate with ML engineers to ensure testability across MCP servers.

The role focuses on safety, governance, and reliable agentic performance in a regulated engineering environment. You will build automated test pipelines for agentic behaviours, monitor for hallucinations and tool misuse,

Qualifications

• Strong Python experience for test harnesses and automation.
• Experience with LLM and RAG evaluation frameworks or custom evaluation pipelines.
• Test automation expertise covering unit, integration, and regression testing.
• Understanding of agentic system risks and failure modes.
• Ability to assess solutions against governance, security, and audit expectations.

Responsibilities

• Define and implement evaluation frameworks for MCP tools and Skills covering correctness, safety, and regression impact.
• Build and maintain automated test pipelines for agentic behaviours, including tool invocation and multi-step workflows.
• Evaluate and mitigate agentic failure modes such as hallucination, tool misuse, invalid inputs, and latency amplification.
• Produce testing evidence required for Permit to Build (PTB) and Permit to Operate (PTO).
• Partner with ML Engineers to embed testability and evaluation hooks into MCP servers and Skills.
• Help define the long-term quality and governance model for federated MCP contributions across LSEG.

Skills

Python

Evaluation frameworks

Test automation

Agentic system risk

Governance & security

Regulated environment

Job description

Corporate Engineering AI (CE AI) Team

The Corporate Engineering AI team is the central enablement and platform delivery function for LSEG’s internal agentic AI ecosystem. The team’s mission is to scale safe, high‑quality AI capabilities across the enterprise by providing shared platforms, patterns, governance, and delivery support.

CE AI owns and operates core AI platforms including LSEG AI Assist, the Question Answering Service (QAS), and the Internal MCP Gateway. Rather than delivering individual business use cases end‑to‑end, the team enables product engineering groups across LSEG to expose knowledge, data, and actions to AI agents in a consistent, governed, and repeatable way.

The team operates a Central MCP Delivery model: building critical MCP tools and services “for” product teams where required, while simultaneously defining standards, patterns, and platform capabilities that allow teams to progressively move towards self‑service contribution.

LSEG AI Assist / Internal MCP Programme of Work

This programme delivers an LSEG‑owned, production‑grade agentic AI platform with MCP as its extensibility layer. The scope of work includes:

• Building and operating LSEG AI Assist, an in‑house agentic experience capable of reasoning, planning, and tool‑calling.
• Operating QAS, the enterprise RAG and search layer used to ground agent responses in approved data sources.
• Delivering a production Internal MCP Gateway providing discovery, security, policy enforcement, observability, and lifecycle management for MCP tools and Skills.
• Designing and building MCP servers and Skills that expose internal and vendor systems safely to agents.
• Establishing evaluation, quality control, and governance mechanisms so MCP tools and Skills can be promoted through PTB/PTO and operated with confidence at scale.

The programme follows a “build for” model today, with a strong emphasis on defining the future product and platform experience, patterns, and contribution pathways that will enable federated scale over time.

Quality Engineers – Responsibilities & Skills

Responsibilities

• Define and implement evaluation frameworks for MCP tools and Skills covering correctness, safety, and regression impact.
• Build and maintain automated test pipelines for agentic behaviours, including tool invocation and multi‑step workflows.
• Evaluate and mitigate agentic failure modes such as hallucination, tool misuse, invalid inputs, and latency amplification.
• Produce testing evidence required for Permit to Build (PTB) and Permit to Operate (PTO).
• Partner with ML Engineers to embed testability and evaluation hooks into MCP servers and Skills.
• Help define the long‑term quality and governance model for federated MCP contributions across LSEG.

Skills

• Strong Python experience for test harnesses and automation.
• Experience with LLM and RAG evaluation frameworks or custom evaluation pipelines.
• Test automation expertise covering unit, integration, and regression testing.
• Understanding of agentic system risks and failure modes.
• Ability to assess solutions against governance, security, and audit expectations.
• Experience working in regulated or highly governed engineering environments.

Career Stage: Senior Associate

Information:

Join us and be part of a team that values innovation, quality, and continuous improvement. If you're ready to take your career to the next level and make a significant impact, we'd love to hear from you.

LSEG is a leading global financial markets infrastructure and data provider. Our purpose is driving financial stability, empowering economies and enabling customers to create sustainable growth. Our purpose is the foundation on which our culture is built. Our values of Integrity, Partnership, Excellence and Change underpin our purpose and set the standard for everything we do, every day. They go to the heart of who we are and guide our decision making and everyday actions. Working with us means that you will be part of a dynamic organisation of 25,000 people across 65 countries. However, we will value your individuality and enable you to bring your true self to work so you can help enrich our diverse workforce.

We are proud to be an equal opportunities employer. This means that we do not discriminate on the basis of anyone’s race, religion, colour, national origin, gender, sexual orientation, gender identity, gender expression, age, marital status, veteran status, pregnancy or disability, or any other basis protected under applicable law. Conforming with applicable law, we can reasonably accommodate applicants' and employees' religious practices and beliefs, as well as mental health or physical disability needs.

You will be part of a collaborative and creative culture where we encourage new ideas. We are committed to sustainability across our global business and we are proud to partner with our customers to help them meet their sustainability objectives. Our charity, the LSEG Foundation provides charitable grants to community groups that help people access economic opportunities and build a secure future with financial independence. Colleagues can get involved through fundraising and volunteering.

LSEG offers a range of tailored benefits and support, including healthcare, retirement planning, paid volunteering days and wellbeing initiatives.

Please take a moment to read this privacy notice carefully, as it describes what personal information London Stock Exchange Group (LSEG) (we) may hold about you, what it’s used for, and how it’s obtained, your rights and how to contact us as a data subject.

LSEG (London Stock Exchange Group) is a leading global financial markets infrastructure and data provider. Our culture of connecting, creating opportunity and delivering excellence shapes how we think, how we do things and how we help our people fulfil their potential. Our Data & Analytics, Capital Markets and Post Trade divisions have a combined power that provides a comprehensive, integrated suite of trusted financial market infrastructure services to help our customers pursue their ambitions. Explore our divisions LSEG is headquartered in the United Kingdom, with significant operations in 70 countries across Europe, the Middle East, Africa, North America, Latin America and Asia Pacific. Find out more Get to know some of our people who are pushing the boundaries of technology, finance and more around the world.