Senior Specialist, Quality Engineering

Position Summary

This role is responsible for leading the technical implementation of non-functional testing and quality engineering controls across the technology lifecycle, with a strong emphasis on performance, latency, scalability, resilience, system-level analysis, and Python-based test automation. The role requires deep understanding of UNIX/Linux operating systems, networking, and distributed systems, ensuring technology solutions meet stringent performance and reliability requirements aligned with business and customer needs.

Role Responsibilities

• Responsible for the technical implementation of performance and non-functional quality controls, providing mentorship where complex system-level issues arise.
• Develops and executes performance, load, stress, endurance, and resilience testing programmes across the entire technology lifecycle, ensuring systems meet required latency, throughput, and stability expectations.
• Leads a wide range of non-functional quality control planning and execution activities in alignment with organisational standards and strategy.
• Captures non-functional testing requirements by evaluating product requirement specifications and raises clarifications with product owners, business analysts, architects, and engineering teams.
• Designs and reviews test approaches and test scripts for API, integration, and backend system validation using Python and UNIX/Linux-based toolsets.
• Supervises the execution and analysis of performance, latency, resilience, and operational readiness tests, ensuring identified issues are resolved in collaboration with engineering and infrastructure teams.
• Recommends and implements improvements to non-functional testing frameworks, processes, tooling, and best practices.
• Ensures that non-functional aspects of a product/service meet or exceed required standards and objectives to achieve the desired level of quality.
• Applies modern engineering and DevOps practices to embed continuous performance and resilience testing into CI/CD pipelines.
• Maintains documentation to describe system behaviour, architectural decisions, performance models, and test outcomes, including detailed analysis of system and network-level findings.

Preferred Skills and Experience

• 6+ years of experience in Software Quality Engineering, including strong exposure to non-functional and system-level testing.
• Degree in Computer Science, Software Engineering, or equivalent.
• ISTQB certification or equivalent qualification is an advantage.
• Strong experience in non-functional testing including Latency, performance, load, stress and resilience testing.
• Proficiency in Python, Perl or Go for test automation, data validation, and backend/API testing.
• Hands-on expertise with SQL and strong understanding of relational database concepts, including query optimisation, data validation, and troubleshooting database performance behaviours.
• In-depth expertise with UNIX/Linux operating systems, including system monitoring, process analysis, I/O, kernel-level metrics, and performance profiling.
• Strong knowledge of networking concepts, including TCP/IP, DNS, routing, latency analysis, packet flow, and network troubleshooting using tools such as tcpdump and Wireshark.
• Experience with tools such as JMeter, Locust, Gatling, k6, or equivalent performance engineering tools.
• Hands-on experience with CI/CD pipelines (GitLab, Jenkins, Azure DevOps), containerisation (Docker), and orchestration (Kubernetes).
• Good knowledge of software quality assurance processes, agile methodologies, and distributed system architectures.
• Ability to translate sophisticated technical concepts into clear, actionable insights for both technical and non-technical stakeholders.
• Excellent interpersonal skills with the ability to collaborate across cultures, languages, and technical disciplines.
• Proven experience working in environments with real-time, low-latency, or high-throughput systems; financial domain experience is an advantage.
• Knowledge of integration patterns, messaging technologies, and backend system communication across applications and platforms.
• Demonstrated ability for continuous self‑learning, staying updated with emerging technologies, tools, performance engineering practices, and industry trends.
• Relevant certifications are considered an added advantage, including but not limited to AWS Solutions Architect, Red Hat System Administration, Oracle High Availability certifications, Other cloud, networking, database, or system engineering certifications

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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