Senior Python Engineer – Engineered Index & Rates

FTSE International Limited; Greater London; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Healthcare

Retirement planning

Paid volunteering days

Wellbeing initiatives

Job summary

London Stock Exchange Group (LSEG) is seeking a Senior Python Engineer to develop and support platforms for index and benchmark solutions within the FICC Engineering team in London. You will be a hands-on engineer designing scalable software and solving complex problems with minimal supervision.

Bring 7+ years of software development, strong Python, Linux, cloud familiarity, and experience with CI/CD, SQL, and data processing.

Qualifications

• 7+ years of hands-on software development experience, preferably in financial services or data-intensive environments.
• Strong Python development skills and Linux-based environment experience.
• Solid software engineering fundamentals: design, testing, code quality, performance optimization.
• Ability to independently investigate and solve complex technical problems.
• Experience developing and supporting production systems in a business-critical environment.
• Experience with source control and CI/CD tools (Git, GitLab).
• Strong SQL and data processing experience.
• Ability to quickly learn new technologies, domains and data models.

Responsibilities

• Develop and maintain platforms and tools for custom, thematic FICC index and benchmark solutions, focusing on engineered products and rates.
• Design and implement scalable, reliable software solutions using modern engineering practices.
• Collaborate with product, research, and index teams to translate business requirements into technical solutions.
• Investigate, troubleshoot, and resolve complex production, data, and application issues through root-cause analysis.
• Drive platform modernization including cloud adoption and deployment process improvements.
• Enhance software quality, automation, and operational efficiency via testing, code reviews, and CI/CD.
• Work across a diverse technology stack including Python, Linux, cloud technologies, and legacy applications.
• Take ownership of projects from design to production support.

Skills

Python

Linux

CI/CD

SQL

Data processing

Troubleshooting

Ownership

Communication

Cloud technologies

Education

Bachelor’s or Master’s degree in Computer Science/Engineering or related quantitative discipline

Tools

Git

GitLab

Job description

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 culture of connecting, creating opportunity and delivering excellence shapes 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.

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 shapes 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.

THE TEAM:

The Engineered Product Solutions vertical within the FICC Engineering team develops and supports platforms that enable the ideation, back testing, construction, and production of custom, thematic, and bespoke index and benchmark solutions across Fixed Income, Interest Rates, Currencies, and Commodities (FICC).

ROLE SUMMARY:

We are seeking a Senior Python Engineer to develop, enhance, and support these platforms and solutions. The ideal candidate is a hands‑on engineer with strong technical and quantitative software development expertise, including the design and implementation of index/benchmark portfolio construction, index and benchmark analytics, systematic investment strategies, and related quantitative tools and frameworks. Success in this role requires the ability to independently learn new technologies and business concepts, troubleshoot challenging technical issues, and deliver high-quality solutions with minimal supervision. The candidate should demonstrate a strong sense of ownership and accountability, excellent collaboration and communication skills, and a commitment to continuous improvement and engineering excellence.

WHAT YOU'LL BE DOING:

• Develop and maintain platforms and tools supporting custom, thematic, and bespoke FICC index and benchmark solutions, with a focus on engineered products and rates.
• Design and implement scalable, reliable, and maintainable software solutions using modern engineering practices.
• Collaborate with product, research, and index teams to translate business requirements into technical solutions.
• Investigate, troubleshoot, and resolve complex production, data, and application issues through structured root-cause analysis.
• Drive platform modernization initiatives, including cloud adoption and improvements to development and deployment processes.
• Enhance software quality, automation, and operational efficiency through testing, code reviews, and CI/CD best practices.
• Work across a diverse technology stack, including Python, Linux, cloud technologies, and legacy applications.
• Take ownership of projects throughout the full development lifecycle, from solution design and implementation to production support.

WHAT YOU'LL BRING:

• Significant hands‑on software development experience (typically 7+ years), preferably in financial services or data‑intensive environments.
• Strong Python development skills and experience working in Linux-based environments, demonstrated hands‑on programming experience and a solid understanding of software engineering principles.
• Strong software engineering fundamentals, including system design, testing, code quality, and performance optimization.
• Demonstrated ability to independently investigate and solve complex technical problems.
• Experience developing and supporting production systems in a business‑critical environment.
• Experience working with source control and CI/CD tools (e.g., Git, GitLab).
• Strong SQL and data processing experience.
• Ability to quickly learn new technologies, business domains, and data models.
• Strong sense of ownership and accountability, with the ability to drive work independently.
• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related quantitative discipline.
• Desirable but not essential: Experience developing solutions within financial services, market data, index management, quantitative research, or investment management.
• Knowledge of cloud technologies and cloud‑native application architecture.
• Proven track record of building scalable data platforms, analytics tools, or workflow automation solutions.
• Exposure to real‑time or near real‑time systems, event‑driven architectures, or low‑latency data processing environments.
• Familiarity with legacy technologies such as Perl, Shell scripting, Java, or C/C++.
• Understanding of quantitative analytics and financial instruments.

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.

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.

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 culture of connecting, creating opportunity and delivering excellence shapes how we think, how we do things and how we help our people fulfil their potential. LSEG’s ticker symbol is LSEG. Explore our divisions LSEG is headquartered in the United Kingdom, with significant operations in 70 countries across Europe, the Middle East, Africa, North America, Latin America and Asia Pacific. Find out more Get to know some of our people who are pushing the boundaries of technology, finance and more around the world.