Lead Site Reliability Engineer

ROLE SUMMARY:

We are hiring a Lead Site Reliability Engineer to establish and lead the reliability engineering practice for LSEG's internal observability platform - and this is a rare opportunity to build it from the ground up!

Our platform brings telemetry, dashboards, alerts, service health, and operational insight into one common experience. We use it to help engineering and service teams detect issues earlier, reduce incident impact, and improve operational reliability across LSEG.

The focus of this role is defining and owning how reliability is practised on the platform team - including the SLO and SLI framework, error budget policy, incident response leadership, and the practices that help user teams approach operational reliability through the platform itself. This is a leadership and design role as much as a hands-on engineering role, and we expect you to work with ambiguity, make principled decisions, and build practices that scale beyond the immediate team.

WHAT YOU'LL BE DOING:

Reliability framework and standards:

- Define and own the SLO and SLI framework for the observability platform and the services it supports.

- Set error budget policy and use reliability data to inform engineering prioritisation decisions.

- Build and continuously improve the on-call programme, including rotations, runbooks, escalation paths, and incident playbooks.

- Partner with the Lead Engineer to ensure reliability is designed into the platform, not retrofitted.

- Use the observability platform itself to monitor the platform's own health and service levels.

Incident response and team leadership:

- Lead incident response for the platform, including command, communication, escalation, and post-incident review.

- Drive toil reduction through automation, improved tooling, and better operational patterns.

- Mentor and develop SRE practitioners on the team.

Platform contribution and reporting:

- Provide clear reporting on reliability posture, risk, and improvement trends to engineering and service leadership.

- Contribute to the platform roadmap from a reliability and operational fitness perspective.

WHAT YOU'LL BRING:

Essential skills and experience:

- Extensive experience in SRE, platform reliability, or equivalent hands-on reliability engineering, including experience in a lead or senior individual contributor position.

- Proven experience designing and implementing SLO and SLI frameworks at enterprise or multi-team scale.

- Deep understanding of distributed systems failure modes, resilience patterns, and blast radius management.

- Experience leading incident response, including command, structured communication, and post-incident review.

- Ability to influence engineering decisions and reliability practices across teams without direct management authority.

- Strong written and verbal communication skills for distributed, cross-timezone teams.

- Experience mentoring or developing other SRE practitioners.

Desirable skills and experience:

- Experience with OpenTelemetry, Grafana, ClickHouse, Cribl, Datadog, BigPanda, Redis, or similar observability and data pipeline technologies.

- Experience establishing a reliability engineering practice in a greenfield or early-stage platform context.

- Familiarity with PromQL, ClickHouse SQL, or equivalent query languages for SLI design and reliability dashboards.

- Experience in a regulated, financial services, or large enterprise technology environment.

WHAT YOU'LL GET IN RETURN:

This is an exceptional opportunity to shape reliability engineering for a strategic platform that will influence how teams across LSEG operate their services!

We are committed to building an inclusive workplace where people from all backgrounds can grow and do meaningful work. We welcome applications from candidates with different experiences, perspectives, and career paths.

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.

Career Stage:

Manager

London Stock Exchange Group (LSEG) 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.

If you are submitting as a Recruitment Agency Partner, it is essential and your responsibility to ensure that candidates applying to LSEG are aware of this privacy notice.