Lead Software Engineer C - lseg

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.

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.

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.

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

Strong professional experience in modern C++, including:

Memory management and performance optimization