Location
London

Hours
Full Time

Salary
Negotiable

About the Role
This is an individual contributor role responsible for the design, development, and delivery of high-quality software solutions using C++ and Java within a defined product, platform, or client solution area. The role emphasizes hands-on engineering, strong ownership of medium-to-large technical components, and adherence to established architectural and engineering standards. You will collaborate closely with senior engineers, architects, product managers, and delivery teams to implement technical changes that improve business and client outcomes. While not an architect or people manager, the role requires strong technical judgment, mentoring of junior engineers, and meaningful contribution to solution design and delivery excellence.

You will design, develop, and maintain C++ and Java applications and services, delivering robust, performant, and maintainable solutions. Responsibilities include implementing technical changes and enhancements to improve platform stability, scalability, and client outcomes; collaborating with product owners and business partners to translate requirements into effective technical designs; building solution-level extensions and component enhancements in line with LSEG architectural principles and coding standards; and escalating architectural concerns or technical risks as appropriate.

Additionally, you will take technical ownership of key components or subsystems, ensuring high code quality, strong test coverage, and operational readiness. You will contribute to solution and component design to ensure maintainable, extensible, and well-documented codebases across both C++ and Java stacks. Supporting full lifecycle delivery including estimation, design, development, testing, release, and production support is expected. You will diagnose and resolve complex issues across development, QA, and production environments, including performance and concurrency-related challenges.

Active participation in code reviews, design discussions, and technical forums is essential, as is providing technical guidance and mentoring to junior engineers, particularly in C++/Java best practices and design patterns. You will ensure adherence to SDLC standards, engineering controls, and quality metrics, contributing to healthy team-level engineering baselines.

About London Stock Exchange Group (LSEG)
LSEG is a diversified global financial markets infrastructure and data business with a 300-year history of supporting financial stability and growth worldwide. Headquartered in the UK with significant operations across 70 countries, LSEG employs 25,000 people globally. The company values integrity, partnership, excellence, and change, fostering an inclusive culture that encourages innovation, diversity, and personal growth. LSEG is committed to sustainability and community engagement through its charitable foundation and offers a range of benefits including healthcare, retirement planning, paid volunteering days, and wellbeing initiatives.

Experience
- Strong, hands-on software engineering experience in C++ and Java with a proven track record of designing and delivering medium-to-large scale systems
- Industry experience at a senior engineer or technical-lead-equivalent level
- Solid understanding of object-oriented design, data structures, algorithms, concurrency, memory management, and system integration
- Experience building and supporting distributed systems, including messaging, APIs, and inter-service communication
- Familiarity with Linux environments, build tools, version control systems, and automated testing frameworks
- Experience with modern engineering practices such as CI/CD, performance tuning, and observability
- Exposure to cloud platforms and open-source technologies and integrating them into enterprise systems
- Strong understanding of the full software development lifecycle (SDLC) and associated tools and processes

About you
- Strong communication and collaboration skills with the ability to influence technical outcomes without formal authority
- Demonstrated technical judgment and mentoring capabilities
- Motivated to contribute to continuous improvement and engineering excellence

Qualifications
Bachelor’s degree in Computer Science, Engineering, or equivalent practical experience