Role summary
As a Senior Site Reliability Engineer (SRE), you’ll provide deep reliability and operational expertise for business-critical cloud services. You’ll help set the reliability strategy (for example, defining SLOs and error budgets), design the observability and automation that keep services balanced, and lead improvements that reduce operational risk and customer impact. This role suits people who enjoy solving complex production problems and raising the standard for engineering excellence—regardless of whether your background is SRE, DevOps, Platform Engineering, Systems Engineering, or Software Engineering with strong operations experience.

On-call: You’ll take part in a 24x7 team on-call rotation. As a senior specialist, you’ll help improve how we run on-call by reducing noisy alerts, automating repetitive tasks, and strengthening operational readiness so incidents become less frequent and easier to resolve. From time to time, this may include planned out-of-hours maintenance to support a highly available service. We aim to share the load fairly and continuously improve the on-call experience.

Key responsibilities

• Own reliability outcomes for critical user journeys and cloud components by defining SLIs/SLOs, setting error budgets, and using data to prioritise resilience work.
• Design observability standards (metrics, logs, traces, dashboards, alerting) using tools such as Datadog and AWS CloudWatch so teams can detect issues early and diagnose them quickly.
• Lead major incident response as incident commander when needed, drive blameless post-incident reviews, and ensure corrective actions are implemented and measured.
• Improve platform resilience and scalability through reliability architecture reviews, capacity and performance engineering, and proactive risk assessments.
• Reduce toil by automating repetitive operational work (for example with Terraform, CI/CD, and scripting), and track improvements through clear operational metrics.
• Partner with Product, Engineering, Customer Support, Security, and leadership to balance reliability, feature delivery, compliance obligations, and customer impact.
• Create and maintain operational documentation, runbooks, and change procedures, and raise standards through reviews, templates, and shared practices.
• Coach and mentor engineers, helping teams adopt SRE ways of working and strengthening operational ownership.

What you’ll bring

• Significant experience in SRE/DevOps/Platform Engineering (or equivalent practical experience) supporting production services and making reliability improvements that stick.
• Demonstrated ownership of reliability practices such as SLOs, error budgets, incident management, post-incident actions, and operational readiness.
• Strong AWS knowledge and hands-on experience operating cloud services (for example: EKS, Lambda, SQS, API Gateway, DocumentDB, RDS/MySQL, and CloudWatch/CloudWatch Insights).
• Experience with infrastructure-as-code and automation (for example, Terraform) and with CI/CD pipelines (for example, GitLab CI/CD).
• Experience with Kubernetes, including production operations on managed platforms such as Amazon EKS.
• Ability to script to automate and solve (for example, Python and/or JavaScript), with an engineering approach to testing, review, and maintainability.
• Experience building actionable monitoring and alerting that balances sensitivity and noise (for example, Datadog and CloudWatch).
• Confidence presenting, staying calm during incidents, and influencing teams through data, clear writing, and pragmatic recommendations.

Good to have Skills:

Experience operating Kubernetes clusters beyond day-to-day use (upgrades, networking, security, policy, and multi-tenant considerations).

Experience with performance testing, load testing, and capacity modelling for cloud-native services.

Software engineering experience in Python and/or JavaScript beyond scripting (testing, packaging, code reviews).

Experience improving observability practices at scale (for example: metric develop, alert tuning, incident analytics).

We're proud to have been recognised as a Great Place to Work® in India ‘25

Career Stage:

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.

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