Senior Software Engineer (C++ Office Add-in)

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 , North America, Latin America and Asia Pacific. We employ 25,000 people globally, more than half located in Asia Pacific.

Role Summary

The Senior C++ Developer applies strong software engineering principles and deep knowledge of the software development lifecycle to design, build, and guide the delivery of high-performance and scalable solutions.

This role is primarily focused on modern C++ development, contributing to the core logic and performance-critical components of an Office Add-in, while also supporting backend and integration layers using Node.js and TypeScript.

The position includes architectural input, mentoring engineers, and ensuring seamless integration between native components and web-based technologies within the Office Add-in ecosystem.

What You’ll Be Doing

• Design, develop, and maintain performance-critical components using modern C++, ensuring efficiency, reliability, and maintainability.

• Contribute to the development of an Office Add-in, enabling seamless integration between native C++ components and web-based technologies.

• Build and support backend services and integration layers using Node.js and TypeScript.

• Act as a subject-matter expert in C++ development, advising on architecture, performance optimization, memory management, and interoperability.

• Design and implement solutions that bridge native code with Office Add-in technologies (e.g., APIs, interop layers, or service communication).

• Produce clean, efficient, and well-tested code; conduct thorough code reviews to uphold engineering standards and best practices.

• Collaborate with product managers, designers, and engineers to deliver features aligned with business and user needs.

• Take ownership of deliverables, working independently while mentoring and supporting less experienced engineers.

• Communicate complex technical concepts clearly to both technical and non-technical stakeholders.

• Promote an inclusive, collaborative, and engineering-driven culture.

What You’ll Bring

• Degree in Computer Science, Software Engineering

• Strong professional experience in modern C++, including:

  • Memory management and performance optimization

  • Multithreading and concurrency

  • Building robust and efficient application logic

• Experience with Node.js and TypeScript for backend services and integration layers.

• Solid experience across the full software development lifecycle in an agile environment.

• Experience designing scalable systems and applying appropriate design patterns.

• Familiarity with API design (REST and/or GraphQL), authentication/authorization, and service integration.

• Strong knowledge of testing strategies (unit, integration, end-to-end).

• Exposure to CI/CD pipelines and modern DevOps practices is a plus.

Benefits

We are looking for intellectually curious people, passionate about the bigger picture of how technology industry is evolving, ready to ask difficult questions and deal with complicated scenarios! If you are creative and a problem solver, this is the place to be as will be supporting you to fast-forward your career!

We maximise each employee’s potential through personal development through a wide range of learning tools both formal and informal. We believe in remunerating our people with competitive salaries and a range of attractive benefits such as:

• 25 days’ holiday per year
• 1 additional day off for your Birthday
• Annual wellness allowance
• Share Purchase Plan
• Medical Health Insurance
• Medical Subscription (preventive medical services)
• Life insurance
• Pillar 3 Private Pension
• Meal Vouchers
• Flexible Benefits
• Bookster
• Volunteering Events
• All LSEG colleagues with at least one year’s continuous service, who become parents, are now entitled to at least 26 weeks’ paid leave, and the option to return to work on a phased basis, in relation with specific company’s policy and guidelines

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 across our global business and we are proud to partner with our customers to help them meet their 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.