Tech Lead, Platform SRE

Role Overview

We are seeking a highly skilled Tech Lead, Platform Site Reliability Engineering to provide deep technical leadership across our Unix/Linux platform stack. This role is primarily an individual‑contributor position, responsible for driving reliability, automation, observability, and performance of mission‑critical Unix/Linux platforms.
Although this role does not directly manage a team, experience mentoring engineers, influencing technical direction, and guiding cross‑functional groups will be considered a strong advantage.

The ideal candidate is a hands‑on engineer who thrives in complex infrastructure environments, embodies SRE principles, and consistently seeks to automate, optimize, and elevate platform reliability.

Key Responsibilities

Platform Reliability & Operational Excellence

• Ensure high availability, performance, and resilience of Unix/Linux platforms through proactive monitoring, tuning, and engineering improvements.

• Lead major incident response efforts, drive root‑cause analysis (RCA), and implement long‑term corrective actions to prevent recurrence.

• Partner with L2/L3 teams to resolve escalated issues and minimize business impact.

Infrastructure Automation & Engineering

• Design, build, and maintain automation for provisioning, configuration, lifecycle management, patching, and operational workflows.

• Reduce manual toil by leveraging tools such as Ansible, Terraform, and scripting languages (Python, Bash, Perl).

• Champion infrastructure‑as‑code (IaC) practices and platform engineering best practices.

Observability, Monitoring & SRE Practices

• Enhance observability using metrics, logs, traces, and alerting (Datadog, Grafana, Prometheus, Nagios, etc.).

• Define, measure, and improve SLIs, SLOs, and error budgets to align service reliability with business goals.

• Develop dashboards, runbooks, reliability indicators, and alerting mechanisms for early detection and rapid mitigation.

Performance, Scalability & Capacity Engineering

• Conduct performance baselining, tuning, and benchmarking to ensure optimal system behavior.

• Perform capacity analysis and forecasting to support growth and future scalability.

Security, Compliance & Platform Governance

• Implement system hardening, patching, vulnerability remediation, and compliance controls across the platform.

• Collaborate with InfoSec teams to ensure adherence to internal and regulatory security standards.

Technical Leadership & Collaboration

• Act as a technical authority, guiding engineers and stakeholders in reliability engineering practices.

• Mentor junior engineers informally, share knowledge, and uplift engineering standards.

• Collaborate with cross‑functional teams (product, cloud, infra, security) to ensure platform reliability aligns with organizational priorities.
  (People‑management experience is not required but is advantageous.)

Documentation & Continuous Improvement

• Maintain accurate technical documentation, runbooks, operational procedures, and architectural designs.

• Drive continuous improvement initiatives focused on automation, stability, and operational excellence.

Required Qualifications

• Bachelor's degree in Computer Science, IT, Engineering, or a related field.

• Master’s degree (MSc) is an added advantage.

Professional Experience

• Minimum of 10 years of experience in a similar working capacity, with strong hands‑on SRE/Platform Engineering experience.

• Proven experience handling large-scale Linux/Unix platforms.

• Experience driving incident management, RCA, and permanent fix implementation.

Technical Skills

• Strong expertise in Unix/Linux administration (RHEL, AIX, Solaris).

• In‑depth understanding of OS internals, kernel parameters, file systems, process management, and performance tuning.

• Proficiency in scripting and programming: Bash, Python, Perl, ksh, etc.

• Hands‑on experience with automation frameworks (Ansible, Terraform).

• Expertise with observability platforms (Datadog, Grafana, Prometheus, Nagios).

• Ability to define SLIs, SLOs, dashboards, alerts, and reliability metrics.

• Experience with virtualization technologies, SAN infrastructure, backup/restore systems, and hardware architectures.

• Knowledge of system hardening, patching strategies, and vulnerability remediation.

• Familiarity with ITIL incident/problem/change management principles.

• Exposure to cloud environments (AWS / Azure / GCP) and containers is a plus.

• Working knowledge of DevOps tools & practices, including CI/CD, version control, pipeline automation, and collaborative engineering workflows.

• Hands‑on skills with containerization technologies such as Docker.

• Practical experience with Kubernetes for container orchestration, deployment, scaling, and cluster management.

Soft Skills & Competencies

• Strong analytical and problem‑solving mindset, especially for complex infrastructure issues.

• Excellent communication and collaboration skills for multi‑team environments.

• Ability to manage priorities, work independently, and operate under pressure.

• SRE‑aligned mindset: automation‑first, reliability‑driven, data‑oriented.

• Willingness to participate in a 24/7 on‑call rotation for critical systems.

• Leadership traits (mentoring, technical guidance, influencing) beneficial.

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.

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