Senior Software Engineer, Quantitative Research Index Research & Design | FTSE Russell | LSEG Role Purpose We are looking for a Senior Software Engineer to join the Index Research & Design team and help build the technology that powers the next generation of index research and product innovation. Working at the intersection of quantitative finance, software engineering, and cloud technologies, you will develop scalable research platforms, analytical libraries, and production-ready software that accelerate research and support the delivery of innovative index products. You will collaborate closely with quantitative researchers, product specialists, and engineering teams to transform research ideas into robust, reusable software while driving the adoption of modern software engineering practices and AI-enabled development tools. What you'll be doing • Design and develop Python-based software, analytical libraries, and reusable components that support index research, methodology development, and product innovation. • Build scalable applications, data pipelines, and analytical frameworks that enable researchers to analyse large financial datasets and efficiently evaluate new index concepts. • Develop high-performance data processing solutions using modern Python technologies, including Polars, PyArrow, and SQL. • Partner with quantitative researchers to transform analytical prototypes into robust, maintainable, production-ready software. • Collaborate with engineering teams to implement research capabilities on AWS and integrate analytical solutions into enterprise platforms. • Design APIs and shared services that improve collaboration between research, engineering, and product teams. • Evaluate and implement AI-assisted development tools and Large Language Model (LLM) technologies to improve software development, research productivity, documentation, and knowledge management. • Champion modern software engineering practices, including automated testing, code reviews, version control, CI/CD, and reproducible development. • Contribute to the technical roadmap of the Index Research & Design team by identifying technologies and approaches that improve scalability, efficiency, and innovation. What we're looking for • Significant experience developing software in quantitative finance, financial data, investment research, or another data-intensive analytical environment. • Expert Python programming skills with experience building high-quality, maintainable software. • Strong experience processing large and complex datasets using modern Python data libraries such as Polars, PyArrow, and SQL. • Experience developing applications or analytical services on AWS or another major cloud platform. • Strong understanding of software architecture, APIs, data engineering concepts, and modern software development practices. • Experience designing scalable analytical tools, reusable software libraries, or research platforms. • Interest in applying AI and LLM technologies to improve software engineering and quantitative research workflows. • Good understanding of financial markets, index methodologies, or quantitative investment concepts, with the ability to collaborate effectively with quantitative researchers. • Excellent communication skills and the ability to work effectively across research, engineering, product, and technology teams. Preferred Qualifications • Experience developing software for financial analytics, investment research, or index-related applications. • Experience building data-intensive applications or distributed analytical workflows. • Familiarity with modern development environments and engineering standards, including Git, automated testing, and CI/CD. • Experience using AI coding assistants or LLM APIs to enhance software development and engineering productivity. • MSc or PhD or equivalent experience or equivalent in Computer Science, Engineering, Mathematics, Finance, or another quantitative field. Why join us The Index Research & Design team is redefining how index research is developed, implemented, and delivered. We are investing in modern software engineering, cloud-native technologies, and AI-enabled workflows to build a scalable research platform that supports innovation across FTSE Russell. This role offers the opportunity to work alongside leading quantitative researchers, engineers, and product specialists while building technology that directly supports globally recognised index products. You will have the opportunity to introduce new technologies, improve research productivity, and help shape the future of research and product development across the organisation. Career Stage: Manager Compensation/Benefits Information: LSEG is committed to offering competitive Compensation and Benefits. The anticipated base salary for this position is $192,400 - $320,600. Please be aware base salary ranges may vary by geographic location, city and state. In addition to our offered base salary, this role is eligible for our Annual Incentive Plan (AIP/”bonus plan”). Target AIP rates will be commensurate with role level and posted career stage. Individual salary will be reflective of job related knowledge, skills and equivalent experience. LSEG roles (excluding internships and part-time roles of less than 20 hours per week) are typically eligible for inclusion in our LSEG Benefits program, which includes offerings of: Annual Wellness Allowance, Paid time-off, Medical, Dental, Vision, Flex Spending & Health Savings Options, Prescription Drug plan, 401(K) Savings Plan and Company match. LSEG’s Benefits plan also includes basic life insurance, disability benefits, emergency backup dependent care, adoption assistance commuter assistance etc. 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. 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