Lead C++ / Java Developer at LSEG – London | Jobyssey

ABOUT US:

LSEG (London Stock Exchange Group) is more than a diversified global financial markets infrastructure and data business. We are dedicated, open-access partners with a dedication to excellence in delivering the services our customers expect from us. With extensive experience, deep knowledge and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs. It’s how we’ve contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years. Through a comprehensive suite of trusted financial market infrastructure services – and our open-access model – we provide the flexibility, stability and trust that enable our customers to pursue their ambitions with confidence and clarity.

LSEG is headquartered in the United Kingdom, with significant operations in 70 countries across EMEA, North America, Latin America and Asia Pacific. We employ 25,000 people globally, more than half located in Asia Pacific. LSEG’s ticker symbol is LSEG.

OUR PEOPLE:

People are at the heart of what we do and drive the success of our business. Our culture of connecting, creating opportunity and delivering excellence shape how we think, how we do things and how we help our people fulfil their potential. We embrace diversity and actively seek to attract individuals with unique backgrounds and perspectives. We break down barriers and encourage teamwork, enabling innovation and rapid development of solutions that make a difference. Our workplace generates an enriching and rewarding experience for our people and customers alike. Our vision is to build an inclusive culture in which everyone feels encouraged to fulfil their potential.

We know that real personal growth cannot be achieved by simply climbing a career ladder – which is why we encourage and enable a wealth of avenues and interesting opportunities for everyone to broaden and deepen their skills and expertise. As a global organisation spanning 70 countries and one rooted in a culture of growth, opportunity, diversity and innovation, LSEG is a place where everyone can grow, develop and fulfil your potential with meaningful careers.

ROLE SUMMARY:

The Lead Software Engineer is a hands-on individual contributor responsible for designing, building, and operating mission‑critical FX market infrastructure and matching platforms using C++ and Java. The role focuses on low‑latency, high‑throughput distributed systems with strict availability, resiliency, and data integrity requirements.

This role owns technical outcomes for complex components and services, influences architecture and platform evolution, and provides deep expertise across development, testing, and production support. While not a line‑management role, it carries strong expectations for technical leadership, mentoring, and collaboration across engineering, architecture, and product teams.

WHAT YOU'LL BE DOING:

Design, develop, and maintain C++ and Java services supporting FX matching and trading workflows.
Own technical delivery for key platform components, ensuring alignment with LSEG architectural principles, performance standards, and operational controls
Build and evolve low‑latency, high‑availability systems handling high message volumes and time‑critical processing.
Ensure systems meet non‑functional requirements, including latency, throughput, resiliency, fault tolerance, security, and observability
Contribute to system and solution architecture, participating in design reviews and providing pragmatic input on scalability and operability.
Work closely with Product, QA, SRE, and Architecture teams to translate business requirements into robust technical solutions.
Diagnose and resolve complex issues across production, QA, and client environments, including root‑cause analysis of cross‑system failures.
Improve code quality and maintainability through clean design, automated testing, performance tuning, and controlled refactoring.
Integrate and manage dependencies on messaging platforms, data distribution systems, and upstream/downstream market infrastructure.
Evaluate and adopt suitable open‑source and third‑party technologies, ensuring they meet regulatory, security, and performance requirements.
Provide technical mentoring through code reviews, design discussions across teams.
Ensure adherence to SDLC standards, engineering best practices, and operational readiness requirements.
Contribute recommendations that influence platform standards, engineering patterns, and architectural direction across FX technology.

WHAT YOU'LL BRING:

Bachelor’s degree in Computer Science, Engineering, or equivalent practical experience.
Strong hands‑on experience in both C++ and Java, delivering production-grade systems.
10+ years of software engineering experience as a senior individual contributor.
Proven delivery experience with low‑latency, high‑throughput, distributed systems, ideally in FX, trading, or matching platforms.
Strong understanding of system integration, messaging, event-driven architectures, and data consistency.
Experience working across the full SDLC, including design, development, automated testing, deployment, and production support.
Familiarity with Linux, CI/CD pipelines, build systems, performance testing, and monitoring/alerting.
Practical experience with cloud platforms, containerization, and open‑source technologies.
Excellent problem-solving skills and the ability to influence technical outcomes without formal authority
Up-to-date with modern engineering practices, tools, and industry trends

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.

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