Senior Java Engineer

London Stock Exchange; Greater London; On-site; GBP 110,000 - 140,000; Full time

Job summary

London Stock Exchange Group (LSEG) is seeking a Senior Java Engineer to help build and scale the new Index platform for FTSE-Russell. You will design, implement, and maintain high‑performance backend services in Java and Python, collaborating with global teams.

You will lead technical initiatives, review code, and mentor juniors while ensuring robust production support and secure, compliant solutions for financial market data.

Qualifications

• 10+ years of backend software engineering experience.
• Strong Java and Python development skills.
• Experience with microservices, REST APIs, and scalable systems.
• Financial services domain familiarity is a plus.
• Mentor junior engineers and lead project priorities.

Responsibilities

• Design, develop, and maintain Java/Python services for the Index platform.
• Lead code reviews and drive quality standards.
• Provide Level 3 production support and issue resolution.
• Collaborate with global teams and AI initiatives.
• Establish automated tests and CI/CD pipelines.

Job description

• We are seeking a hardworking and intellectually curious Senior Java Engineer to join the development of new Index platform for FTSE-Russell Index Business of London Stock Exchange Group(LSEG) in our Fort Mill office
• Index team is responsible for calculations and distribution of Indexes to end clients
• The individual will be working on innovative technologies with a team of developers to implement solutions which support the strategic growth of the Index business, it requires requirement gathering from Index Research, implementation of some sophisticated algorithms with high precision for computation of financial data points
• Design, develop, and maintain Complex Java and Python based applications and services using industry-standard methodologies and tools. Architect new systems or reuse existing systems that drive complex applications
• Collaborate with Product Managers, UX team, and Software Engineers around the globe to deliver outstanding products
• Engage actively from requirements gathering and design to the final stages of testing and deployment, ensuring products meet the highest standards
• Establish and maintain automated tests, guaranteeing applications are robust, scalable, and secure. Proactively solve production issues, deduce root causes, and implement timely fixes or workarounds
• Lead individual project priorities and target commitments
• Perform code reviews to ensure application meets or exceeds specified standards and objectives to achieve desired level of quality
• Demonstrates depth of knowledge and expertise in software design and development to act as the SME in working domain, mentor junior developers on a day-to-day basis
• As a developer, you will be responsible for delivering Level 3 production support by efficiently diagnosing and resolving issues to minimize disruption to business operations
• This includes analysing incidents, identifying root causes, implementing preventive measures, and delivering timely fixes

Good command of coding standards and Strong understanding of both high level and low level software designPrior exposure to Level 3 production support10+ years of hands-on backend software engineering experienceA proactive, creative engineering leader who enjoys solving complex problems, working hands-on with modern technologies, and driving AI enabled innovation. If you’re passionate about building resilient, intelligent, data intensive systems that power global financial markets, we’d love to hear from youSupport the organisation’s AI adoption journey. Develop and enhance intelligent solutions using LLMs, LangChain/LangGraph, and agentic AI frameworksCI/CD tools (Jenkins/GitLab), DevOps automationEstablish engineering best practices for safe, scalable, traceable and production ready AI deployments across internal platforms and external product suitesBuilding highly distributed, data intensive systemsExpertise in:Core Java, PythonDocker, KubernetesStrong algorithms, data structures, problem solving skills, and ability to translate business problems into scalable solutionsRDBMS (Oracle/SQL Server/Postgres)JVM profiling & performance optimisationMicroservices, REST APIsWhat We’re Looking For:Experience leading or mentoring a team of engineersExperience within financial services or with financial market dataFamiliarity with in-memory caching, Spring Boot, Redis, KafkaExperience with BDD frameworks such as Cucumber, JBehave, or KarateBackground as a Scrum Master or experience running Agile teams