Backend Developer - Java

Backend Developer - Java

LSEG (London Stock Exchange Group) is 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. With extensive experience, deep knowledge, and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs. It's how we've contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years. Through a comprehensive suite of trusted financial market infrastructure services – and our open-access model – we provide the flexibility, stability and trust that enable our customers to pursue their ambitions with confidence and clarity. LSEG is headquartered in the United Kingdom, with significant operations in 70 countries across EMEA, North America, Latin America and Asia Pacific. We employ 25,000 people globally, more than half located in Asia Pacific. LSEG's ticker symbol is LSEG.

Position Summary

• This position is within Acadia. Acadia is wholly owned by LSEG (London Stock Exchange Group) and is part of its Post Trade division.
• We're seeking an experienced Senior Java Software Engineer to join our Workflow team, helping us build, scale, and extend our core platform and services. This role is ideal for a hands-on, backend-focused developer who thrives in designing and implementing high-performance, distributed systems and event-driven microservices.
• The successful candidate will play a key role in the end-to-end design, implementation, and optimization of our backend systems, ensuring performance, scalability, and reliability at enterprise scale.

Key Responsibilities

• Design, develop, and enhance highly available, scalable backend services and APIs using Java and related technologies.
• Architect and implement microservices and distributed systems with a focus on performance, fault tolerance, and maintainability.
• Collaborate cross-functionally with product managers, QA engineers, and other development teams to translate business requirements into robust technical solutions.
• Implement event-driven architectures and asynchronous communication patterns (e.g., Kafka, RabbitMQ, or similar).
• Own services end-to-end, from design through deployment and monitoring, ensuring high reliability and quality standards.
• Participate in code reviews, design discussions, and architecture sessions, contributing to best practices and continuous improvement.
• Work with DevOps and CI/CD tools (e.g., Docker, Kubernetes, Jenkins, Ansible) to automate and streamline delivery.
• Maintain and optimize data access and storage using MongoDB or other NoSQL databases.
• Stay current with emerging backend technologies and bring innovative ideas to improve our system design and development practices.

Required Experience and Qualifications

• Bachelor's or Master's degree in Computer Science, Software Engineering, or a related discipline. (highly preferred)
• 6+ years of hands-on development experience with Java (Java 8 or higher) building complex backend systems.
• 8+ years of total software engineering experience in designing and building enterprise-grade applications.
• Proven experience in API development (RESTful and/or GraphQL) and microservice architecture.
• Deep understanding of object-oriented design principles, design patterns, and data structures.
• Strong experience with distributed systems, asynchronous processing, and event-based architectures.
• Hands-on experience working with MongoDB or other NoSQL databases at scale.
• Familiarity with containerization and orchestration technologies such as Docker and Kubernetes.
• Experience implementing CI/CD pipelines using tools like Jenkins, GitLab CI, or similar.
• Proficiency with build tools such as Maven or Gradle, and familiarity with testing frameworks (JUnit, Mockito, etc.).
• Excellent problem-solving skills, attention to detail, and ability to work independently with minimal supervision.
• Strong communication and collaboration skills with cross-functional teams.

Nice to Have

• Experience with frontend technologies such as ReactJS (helpful for end-to-end understanding, not mandatory).
• Exposure to cloud platforms (AWS, Azure, or GCP).
• Experience with monitoring and observability tools (e.g., Prometheus, Grafana, ELK Stack).
• Familiarity with domain-driven design (DDD), CQRS, or event sourcing concepts.