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Senior Engineer, Unix Platform SRE

at London Stock Exchange

Mid LevelNo visa sponsorshipPython

Posted 6 days ago

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Compensation: Not specified
City: Not specified
Country: Not specified

Senior Engineer, Unix Platform SRE will ensure the reliability, availability, and performance of Unix/Linux platforms using SRE methodologies. You will lead incident response for high-severity issues, perform root-cause analysis, and implement permanent fixes in collaboration with L2 teams to minimize business impact. The role covers infrastructure automation, observability, capacity planning, and platform engineering to improve service stability and scalability. You will also contribute to security/compliance, change delivery, and documentation, while participating in 24/7 on-call rotations.

Role Responsibilities

Unix/Linux Platform Reliability: Ensure the reliability, availability, and performance of Unix/Linux platforms by proactively monitoring, optimizing, and improving system stability using SRE methodologies.
Operational Excellence & Incident Response: Lead incident response for high‑severity issues, perform root-cause analysis (RCA), and implement permanent fixes to prevent recurrence. Partner with L2 teams on escalated issues to minimize business impact.
Infrastructure Automation: Design and implement automation for system provisioning, configuration, patching, and operational workflows to reduce toil and improve service consistency.
Observability & Monitoring: Enhance observability through metrics, logging, and alerting solutions (Datadog, Prometheus, etc.), enabling early detection of performance degradation and system anomalies.
Capacity & Performance Engineering: Continuously assess system capacity, forecast resource needs, and optimize performance to support business growth and future scalability.
Platform Engineering: Contribute to the design, enhancement, and lifecycle management of Unix/Linux platform services, ensuring they meet reliability, security, and performance standards.
Security & Compliance: Implement system hardening, patching, vulnerability remediation, and compliance controls to safeguard platform integrity and meet organizational security requirements.
Project & Change Delivery: Support and lead infrastructure and platform-related initiatives, ensuring delivery against availability targets, timelines, and SRE best practices.
Documentation & Knowledge Sharing: Maintain accurate runbooks, architectural documentation, and operational procedures. Promote knowledge-sharing within the team through training, mentoring, and collaborative problem-solving.

Educational Qualifications

Bachelor’s degree in Computer Science, Information Technology, Engineering, or a related field.
MSc degree in a relevant discipline will be an added advantage.

Technical Skills

Strong expertise in Unix/Linux administration (RHEL, AIX, Solaris).
Solid understanding of OS internals, file systems, kernel parameters, process management, and performance tuning.
Strong shell scripting skills (Bash, ksh) and ability to troubleshoot complex OS-level issues.
Strong programming/scripting skills in Python, Perl, etc.
Proven ability to automate operational tasks and reduce toil.
Hands-on experience with automation tools such as Ansible, Terraform.
Practical experience with monitoring and observability platforms (Datadog, Nagios, etc).
Ability to create SLIs, SLOs, dashboards, alerts, and reliability indicators.
Knowledge of infrastructure-as-code tools and platform engineering principles.
Experience with virtualisation technologies, SAN Infrastructure, Backup & Restore and underlying hardware architectures.
Experience with system hardening, patching, and vulnerability remediation.
Familiarity with compliance and security frameworks.
Strong experience in on-call operations, incident response, RCA creation, and implementation of permanent fixes.
Knowledge of ITIL incident, problem, and change management best practices.

Soft Skills & Competencies

Excellent analytical and problem‑solving skills for complex infrastructure issues.
Strong communication and collaboration skills with cross-functional teams.
Ability to manage time, prioritize tasks, and work independently under pressure.
Mindset aligned with SRE culture: reliability, automation, continuous improvement, and data-driven decisions.
Willingness to participate in 24/7 on-call rotation for critical systems.

Career Stage:

Senior Associate

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.

Location: Colombo, Sri Lanka

Time Type: Full time

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