Java engineer

LA International; City Of London; On-site; GBP 80,000 - 110,000; Full time

Job summary

LSEG (London Stock Exchange Group) is seeking a highly technical, hands-on Java developer to contribute to backend services and web applications within the Data & Analytics team. You will design, develop, and maintain backend systems, integrate with frontend components, and collaborate with senior engineers in an Agile environment to deliver scalable trading platform features.

The role requires 4–8+ years of software engineering experience, strong Java fundamentals, Spring, REST, and relational

Qualifications

• BS/MS in Computer Science or equivalent software engineering qualification.
• 4–8+ years of software engineering experience.
• Strong Java fundamentals and modern Spring ecosystem.
• Experience building REST APIs and relational databases.

Responsibilities

• Contributes to design, development, and implementation of backend services and web applications.
• Writes clean, maintainable, and well-tested code following established engineering practices.
• Collaborates with senior engineers and architects in technical design discussions.
• Works with frontend developers to integrate backend services with UI components.
• Supports troubleshooting, debugging, and performance optimization of applications.
• Delivers user stories within agreed timelines and participates in Agile ceremonies.

Skills

Java fundamentals

Spring Framework

REST APIs

React

Web architecture

SQL

Git

Maven/Gradle

Unit testing

Agile

Linux

Education

BS/MS in Computer Science

Tools

Docker

CI/CD

Job description

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 commitment to excellence in delivering the services our customers expect from us.

LSEG Data & Analytics team is seeking a highly technical, hands-on Java developer. Our group is focused on bringing a new level of efficiency, transparency and openness to the trading process by building a collaborative community of investors, brokers, technology firms and content providers.

Through our modular, end-to-end trade management platform, users can: execute everything from simple single stock trades to complex strategies across markets and time zones and manage their risk throughout the trade lifecycle; access our growing network of execution brokers to route Equities, Futures or Options orders globally, as well as dozens of integrated prime and clearing brokers through our growing suite of middle office tools; and collaborate with our broker and vendor partners, who are able to efficiently plug into our platform to reach our community.

This role involves maintenance and enhancement of existing backend and web-based applications, and contributing to the evolution of our trading platform and web user interfaces.

Role responsibilities and key accountabilities:

• Contributes to design, development, and implementation of backend services and web applications.
• Writes clean, maintainable, and well-tested code following established engineering practices.
• Participates in technical design discussions and collaborates with senior engineers and architects.
• Works closely with frontend developers to integrate backend services with UI components.
• Supports troubleshooting, debugging, and performance optimization of applications.
• Breaks down user stories into technical tasks and delivers within agreed timelines.
• Collaborates effectively in Agile teams with product owners, QA, and other developers.
• Maintains and improves existing systems while ensuring stability and reliability.
• Builds positive relationships within the team and contributes to a collaborative environment.
• Communicates technical concepts clearly to both technical and non-technical stakeholders.
• Continuously develops technical expertise and stays up to date with modern technologies and frameworks.

Essential skills

• Strong Java fundamentals (Java 21 preferred) including core concepts (collections, concurrency, memory management).
• Solid experience with Spring Framework (Spring 4+) and Spring Boot 3.x.
• Experience building and consuming REST APIs.
• Good knowledge of React (version 17) and integration with backend services.
• Strong understanding of web application architecture and client-server communication.
• Experience with SQL and relational databases (e.g. PostgreSQL).
• Proficiency with version control (Git) and build tools (Maven/Gradle).
• Strong focus on clean code, unit testing, and code reviews.
• Familiar with Agile development practices.
• Comfortable working in Linux/Unix environments.
• 4-8+ years of software engineering experience.

Other desirable skills

• Experience with JSF / JSP applications and legacy UI technologies.
• Familiarity with modern frontend practices and component-based architectures.
• Experience with CI/CD pipelines and testing practices.Exposure to Docker / containerization.
• Basic understanding of distributed systems.
• Familiarity with Spring ecosystem tooling.
• Knowledge of financial systems or trading platforms is a plus.

Educational background

• BS/MS in Computer Science or equivalent software engineering qualification

We welcome applications from all individuals, regardless of background or identity, and we encourage candidates who may not meet every listed requirement to still apply. If you require any adjustments or support during the recruitment process, please let us know and we will work with you to ensure a fair and accessible experience.

Please Note: If a high volume of applications is received, only candidates shortlisted will be contacted.