Lead Software Developer

Overview

LSEG (London Stock Exchange Group) is a global financial markets infrastructure and data provider. We support customers with intelligent, open-access services and have a long history of contributing to financial stability and growth. This role is to help build the next generation FTSE Russell Index Platform, underpinning the calculation and distribution of FTSE Russell's global index family. It requires advanced engineering, high-precision data processing, and collaboration across global teams.

This is a deeply technical role focused on designing, building, integrating, and ope rationalising modern software and AI-driven capabilities across internal platforms and client-facing products. You will work with innovative technologies, contribute to complex algorithmic design, and drive engineering excellence in a high-performance, data-intensive environment.

• Design, develop, and maintain complex Java and Python applications using modern engineering practices. Build and embed AI-powered features into critical systems.
• Architect and enhance services that support large-scale, performance-critical index computations.
• Collaborate with Product Managers, UX, and engineering teams globally to deliver high-quality products.
• Lead projects end-to-end through requirements, design, development, testing, deployment, and operations.
• Build and maintain automated test suites to ensure performance, scalability, and security.
• Diagnose production issues, identify root causes, and provide Level 3 support and fixes.
• Conduct peer reviews, provide technical leadership, and mentor junior engineers.

• Degree or equivalent experience in Computer Science or Electronics / Electrical Engineering.
• 12+ years of hands-on backend software engineering experience.

A proactive, creative engineering leader who enjoys solving complex problems, works hands-on with modern technologies, and drives AI-enabled innovation. If you are passionate about building resilient, intelligent, data-intensive systems that power global financial markets, we’d love to hear from you.

Required Skills:

• Support the organisation's AI adoption journey. Develop and enhance intelligent solutions using LLMs, Lang Chain/Lang Graph, and agentic AI frameworks.
• Establish engineering guidelines for safe, scalable, traceable and production-ready AI deployments across internal platforms and external product suites.
• Strong algorithms, data structures, problem solving skills, and ability to translate business problems into scalable solutions.
• Good command of coding standards and strong understanding of both high-level and low-level software design.

• Core Java, Python
• Building highly distributed, data-intensive systems
• Microservices, REST APIs
• RDBMS (Oracle/SQL Server/Postgres)
• CI/CD tools (Jenkins/Git Lab), Dev Ops automation
• Docker, Kubernetes
• JVM profiling & performance optimisation
• Prior exposure to Level 3 production support

• Experience leading or mentoring a team of engineers.
• Experience with in financial services or with financial market data.
• Familiarity with in-memory caching, Spring Boot, Redis, Kafka.
• Experience with BDD frameworks such as Cucumber, JBehave, or Karate.
• Background as a Scrum Master or experience running Agile teams.

The LSEG equal opportunity statement and privacy notice are provided to inform applicants of their rights and data handling practices. LSEG is an equal opportunities employer and does not discriminate on race, religion, color, national origin, gender, sexual orientation, gender identity, age, marital status, veteran status, pregnancy or disability, or any other basis protected by applicable law. We may provide reasonable accommodations as required by law.

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