Senior Java Developer - FTSE Russell Index Platform

About the role

LSEG is seeking a highly skilled, hands-on Senior Java Engineer with AI proficiency to help build the next generation FTSE Russell Index Platform, which underpins the calculation and distribution of FTSE Russell's global family of indexes. The role is deeply technical, focused on designing, building, integrating and operationalising modern software and AI-driven capabilities across internal platforms and client-facing products, in a high-performance, data-intensive environment.

Key responsibilities

• Design, develop and maintain complex Java and Python applications using modern engineering practices, 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, from requirements and design through testing, deployment and operations.
• Build and maintain automated test suites for performance, scalability and security.
• Diagnose production issues, identify root causes and deliver Level 3 support and fixes.
• Conduct peer reviews, provide technical leadership and mentor junior engineers.

Required profile

• 10+ years of hands-on backend software engineering experience.
• Support the organisation's AI adoption journey and develop intelligent solutions using LLMs, LangChain/LangGraph and agent AI frameworks.
• Establish engineering guidelines for safe, scalable, traceable and production-ready AI deployments.
• Prior exposure to Level 3 production support.
• Preferred: experience leading or mentoring a team, and experience in financial services or financial market data.

Required skills

• Core Java, Python, microservices, REST APIs and relational databases (Oracle, SQL Server, Postgres).
• CI/CD tools (Jenkins, GitLab), Docker, Kubernetes, JVM profiling and performance optimisation.
• Nice to have: in-memory caching, Spring Boot, Redis, Kafka, BDD frameworks (Cucumber, JBehave, Karate), Scrum Master background, and strong algorithms and concurrency knowledge.